Installer crashes while installing Linux Mint 12

I'm trying to install Linux Mint 12 Gnome 32 bits.
Most times the installer just crashes silently. Never finished a successfully installation of Mint. The DVD check says there are no errors. This time IIRC i did it without network connection, but with it is just the same.
Sometimes i only get to the user setup, other times i get to the user image screen.
My partitioning scheme is:

/dev/sda1 /home
/dev/sda2 / [format]
/dev/sda3 swap

This time i did "sudo ubiquity --debug" and it outputs this:

*** glibc detected *** /usr/bin/python: double free or corruption (out): 0x0be85208 ***
======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x6ebc2)[0x624bc2]
/lib/i386-linux-gnu/libc.so.6(+0x6f862)[0x625862]
/lib/i386-linux-gnu/libc.so.6(cfree+0x6d)[0x62894d]
/usr/lib/i386-linux-gnu/libX11.so.6(XFree+0x1b)[0x6c7823b]
/usr/lib/i386-linux-gnu/libX11.so.6(XFreeEventData+0x3d)[0x6c56fed]
/usr/lib/libgdk-3.so.0(+0x442ec)[0x7762ec]
/usr/lib/libgdk-3.so.0(gdk_display_get_event+0x7e)[0x74a75e]
/usr/lib/libgdk-3.so.0(+0x43eba)[0x775eba]
/lib/i386-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x1df)[0x3a325f]
/lib/i386-linux-gnu/libglib-2.0.so.0(+0x43990)[0x3a3990]
/lib/i386-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x6a)[0x3a3c2a]
/usr/lib/libgtk-3.so.0(gtk_main_iteration+0x28)[0x110e088]
/usr/lib/i386-linux-gnu/libffi.so.6(ffi_call_SYSV+0x1a)[0xde635a]
/usr/lib/i386-linux-gnu/libffi.so.6(ffi_call+0x6f)[0xde608f]
/usr/lib/libgirepository-1.0.so.1(+0x819b)[0x52919b]
/usr/lib/libgirepository-1.0.so.1(g_function_info_invoke+0xb1)[0x52a6f1]
/usr/lib/python2.7/dist-packages/gi/_gi.so(+0x10b17)[0x511b17]
/usr/bin/python(PyEval_EvalFrameEx+0x38f1)[0x80fade1]
/usr/bin/python(PyEval_EvalCodeEx+0x621)[0x80fdcd1]
/usr/bin/python(PyEval_EvalFrameEx+0x7ef)[0x80f7cdf]
/usr/bin/python(PyEval_EvalCodeEx+0x154)[0x80fd804]
/usr/bin/python(PyEval_EvalFrameEx+0x7ef)[0x80f7cdf]
/usr/bin/python(PyEval_EvalFrameEx+0x930)[0x80f7e20]
/usr/bin/python(PyEval_EvalFrameEx+0x930)[0x80f7e20]
/usr/bin/python(PyEval_EvalCodeEx+0x621)[0x80fdcd1]
/usr/bin/python(PyEval_EvalFrameEx+0x7ef)[0x80f7cdf]
/usr/bin/python(PyEval_EvalCodeEx+0x154)[0x80fd804]
/usr/bin/python(PyEval_EvalFrameEx+0x7ef)[0x80f7cdf]
/usr/bin/python(PyEval_EvalFrameEx+0x930)[0x80f7e20]
/usr/bin/python(PyEval_EvalCodeEx+0x154)[0x80fd804]
/usr/bin/python(PyEval_EvalCode+0x57)[0x80fe177]
/usr/bin/python[0x811acd0]
/usr/bin/python(PyRun_FileExFlags+0x89)[0x811b8e9]
/usr/bin/python(PyRun_SimpleFileExFlags+0x17c)[0x811c4cc]
/usr/bin/python(Py_Main+0x536)[0x812c7c6]
/usr/bin/python(main+0x1b)[0x805da0b]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x5cf113]
/usr/bin/python[0x805fd45]
======= Memory map: ========
00110000-0029d000 r-xp 00000000 07:00 23618 /lib/i386-linux-gnu/libcrypto.so.1.0.0
0029d000-002ab000 r--p 0018c000 07:00 23618 /lib/i386-linux-gnu/libcrypto.so.1.0.0
002ab000-002b1000 rw-p 0019a000 07:00 23618 /lib/i386-linux-gnu/libcrypto.so.1.0.0
002b1000-002b4000 rw-p 00000000 00:00 0
002b4000-002bf000 r-xp 00000000 07:00 46827 /usr/lib/python2.7/lib-dynload/pyexpat.so
002bf000-002c0000 r--p 0000a000 07:00 46827 /usr/lib/python2.7/lib-dynload/pyexpat.so
002c0000-002c1000 rw-p 0000b000 07:00 46827 /usr/lib/python2.7/lib-dynload/pyexpat.so
002c1000-002c2000 rw-p 00000000 00:00 0
002c2000-002e8000 r-xp 00000000 07:00 23623 /lib/i386-linux-gnu/libexpat.so.1.5.2
002e8000-002e9000 ---p 00026000 07:00 23623 /lib/i386-linux-gnu/libexpat.so.1.5.2
002e9000-002eb000 r--p 00026000 07:00 23623 /lib/i386-linux-gnu/libexpat.so.1.5.2
002eb000-002ec000 rw-p 00028000 07:00 23623 /lib/i386-linux-gnu/libexpat.so.1.5.2
002ec000-002f1000 r-xp 00000000 07:00 52971 /usr/lib/i386-linux-gnu/libcairo-gobject.so.2.11000.2
002f1000-002f2000 r--p 00005000 07:00 52971 /usr/lib/i386-linux-gnu/libcairo-gobject.so.2.11000.2
002f2000-002f3000 rw-p 00006000 07:00 52971 /usr/lib/i386-linux-gnu/libcairo-gobject.so.2.11000.2
002f3000-002f6000 r-xp 00000000 07:00 23547 /lib/i386-linux-gnu/libdl-2.13.so
002f6000-002f7000 r--p 00002000 07:00 23547 /lib/i386-linux-gnu/libdl-2.13.so
002f7000-002f8000 rw-p 00003000 07:00 23547 /lib/i386-linux-gnu/libdl-2.13.so
002f8000-00314000 r-xp 00000000 07:00 23554 /lib/i386-linux-gnu/libselinux.so.1
00314000-00315000 r--p 0001b000 07:00 23554 /lib/i386-linux-gnu/libselinux.so.1
00315000-00316000 rw-p 0001c000 07:00 23554 /lib/i386-linux-gnu/libselinux.so.1
00316000-00317000 rwxp 00000000 00:00 0
00317000-0032e000 r-xp 00000000 07:00 47368 /usr/lib/python2.7/dist-packages/_dbus_bindings.so
0032e000-0032f000 r--p 00016000 07:00 47368 /usr/lib/python2.7/dist-packages/_dbus_bindings.so
0032f000-0033b000 rw-p 00017000 07:00 47368 /usr/lib/python2.7/dist-packages/_dbus_bindings.so
0033b000-0035e000 r-xp 00000000 07:00 52252 /usr/lib/i386-linux-gnu/libdbus-glib-1.so.2.2.0
0035e000-0035f000 r--p 00022000 07:00 52252 /usr/lib/i386-linux-gnu/libdbus-glib-1.so.2.2.0
0035f000-00360000 rw-p 00023000 07:00 52252 /usr/lib/i386-linux-gnu/libdbus-glib-1.so.2.2.0
00360000-00457000 r-xp 00000000 07:00 23572 /lib/i386-linux-gnu/libglib-2.0.so.0.3000.0
00457000-00458000 r--p 000f6000 07:00 23572 /lib/i386-linux-gnu/libglib-2.0.so.0.3000.0
00458000-00459000 rw-p 000f7000 07:00 23572 /lib/i386-linux-gnu/libglib-2.0.so.0.3000.0
00459000-0045b000 r-xp 00000000 07:00 53108 /usr/lib/i386-linux-gnu/libXinerama.so.1.0.0
0045b000-0045c000 r--p 00001000 07:00 53108 /usr/lib/i386-linux-gnu/libXinerama.so.1.0.0
0045c000-0045d000 rw-p 00002000 07:00 53108 /usr/lib/i386-linux-gnu/libXinerama.so.1.0.0
0045e000-004a6000 r-xp 00000000 07:00 23505 /lib/i386-linux-gnu/libssl.so.1.0.0
004a6000-004a8000 r--p 00047000 07:00 23505 /lib/i386-linux-gnu/libssl.so.1.0.0
004a8000-004ab000 rw-p 00049000 07:00 23505 /lib/i386-linux-gnu/libssl.so.1.0.0
004ab000-004e8000 r-xp 00000000 07:00 23566 /lib/i386-linux-gnu/libpcre.so.3.12.1
004e8000-004e9000 r--p 0003c000 07:00 23566 /lib/i386-linux-gnu/libpcre.so.3.12.1
004e9000-004ea000 rw-p 0003d000 07:00 23566 /lib/i386-linux-gnu/libpcre.so.3.12.1
004ea000-004fd000 r-xp 00000000 07:00 23564 /lib/i386-linux-gnu/libresolv-2.13.so
004fd000-004fe000 r--p 00012000 07:00 23564 /lib/i386-linux-gnu/libresolv-2.13.so
004fe000-004ff000 rw-p 00013000 07:00 23564 /lib/i386-linux-gnu/libresolv-2.13.so
004ff000-00501000 rw-p 00000000 00:00 0
00501000-0051e000 r-xp 00000000 07:00 48402 /usr/lib/python2.7/dist-packages/gi/_gi.so
0051e000-0051f000 r--p 0001c000 07:00 48402 /usr/lib/python2.7/dist-packages/gi/_gi.so
0051f000-00521000 rw-p 0001d000 07:00 48402 /usr/lib/python2.7/dist-packages/gi/_gi.so
00521000-00555000 r-xp 00000000 07:00 45897 /usr/lib/libgirepository-1.0.so.1.0.0
00555000-00556000 r--p 00033000 07:00 45897 /usr/lib/libgirepository-1.0.so.1.0.0
00556000-00557000 rw-p 00034000 07:00 45897 /usr/lib/libgirepository-1.0.so.1.0.0
00557000-00576000 r-xp 00000000 07:00 48385 /usr/lib/python2.7/dist-packages/gi/_gobject/_gobject.so
00576000-00577000 r--p 0001e000 07:00 48385 /usr/lib/python2.7/dist-packages/gi/_gobject/_gobject.so
00577000-00579000 rw-p 0001f000 07:00 48385 /usr/lib/python2.7/dist-packages/gi/_gobject/_gobject.so
00579000-0058a000 r-xp 00000000 07:00 46817 /usr/lib/python2.7/lib-dynload/datetime.so
0058a000-0058b000 r--p 00010000 07:00 46817 /usr/lib/python2.7/lib-dynload/datetime.so
0058b000-0058e000 rw-p 00011000 07:00 46817 /usr/lib/python2.7/lib-dynload/datetime.so
0058e000-00595000 r-xp 00000000 07:00 52981 /usr/lib/i386-linux-gnu/libXrandr.so.2.2.0
00595000-00596000 r--p 00006000 07:00 52981 /usr/lib/i386-linux-gnu/libXrandr.so.2.2.0
00596000-00597000 rw-p 00007000 07:00 52981 /usr/lib/i386-linux-gnu/libXrandr.so.2.2.0
00597000-00599000 r-xp 00000000 07:00 52712 /usr/lib/i386-linux-gnu/libXcomposite.so.1.0.0
00599000-0059a000 r--p 00001000 07:00 52712 /usr/lib/i386-linux-gnu/libXcomposite.so.1.0.0
0059a000-0059b000 rw-p 00002000 07:00 52712 /usr/lib/i386-linux-gnu/libXcomposite.so.1.0.0
0059b000-005b2000 r-xp 00000000 07:00 23520 /lib/i386-linux-gnu/libpthread-2.13.so
005b2000-005b3000 r--p 00016000 07:00 23520 /lib/i386-linux-gnu/libpthread-2.13.so
005b3000-005b4000 rw-p 00017000 07:00 23520 /lib/i386-linux-gnu/libpthread-2.13.so
005b4000-005b6000 rw-p 00000000 00:00 0
005b6000-0072c000 r-xp 00000000 07:00 23553 /lib/i386-linux-gnu/libc-2.13.so
0072c000-0072e000 r--p 00176000 07:00 23553 /lib/i386-linux-gnu/libc-2.13.so
0072e000-0072f000 rw-p 00178000 07:00 23553 /lib/i386-linux-gnu/libc-2.13.so
0072f000-00732000 rw-p 00000000 00:00 0
00732000-007a8000 r-xp 00000000 07:00 46773 /usr/lib/libgdk-3.so.0.200.0
007a8000-007aa000 r--p 00075000 07:00 46773 /usr/lib/libgdk-3.so.0.200.0
007aa000-007ab000 rw-p 00077000 07:00 46773 /usr/lib/libgdk-3.so.0.200.0
007ab000-007ad000 r-xp 00000000 07:00 53023 /usr/lib/i386-linux-gnu/libXdamage.so.1.1.0
007ad000-007ae000 r--p 00001000 07:00 53023 /usr/lib/i386-linux-gnu/libXdamage.so.1.1.0
007ae000-007af000 rw-p 00002000 07:00 53023 /usr/lib/i386-linux-gnu/libXdamage.so.1.1.0
007af000-007b1000 r-xp 00000000 07:00 52861 /usr/lib/i386-linux-gnu/libxcb-shm.so.0.0.0
007b1000-007b2000 r--p 00001000 07:00 52861 /usr/lib/i386-linux-gnu/libxcb-shm.so.0.0.0
007b2000-007b3000 rw-p 00002000 07:00 52861 /usr/lib/i386-linux-gnu/libxcb-shm.so.0.0.0
007b3000-007b4000 r-xp 00000000 07:00 53115 /usr/lib/i386-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-svg.so
007b4000-007b5000 r--p 00000000 07:00 53115 /usr/lib/i386-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-svg.so
007b5000-007b6000 rw-p 00001000 07:00 53115 /usr/lib/i386-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-svg.so
007b6000-007de000 r-xp 00000000 07:00 23619 /lib/i386-linux-gnu/libm-2.13.so
007de000-007df000 r--p 00028000 07:00 23619 /lib/i386-linux-gnu/libm-2.13.so
007df000-007e0000 rw-p 00029000 07:00 23619 /lib/i386-linux-gnu/libm-2.13.so
007e0000-00922000 r-xp 00000000 07:00 52829 /usr/lib/i386-linux-gnu/libgio-2.0.so.0.3000.0
00922000-00924000 r--p 00142000 07:00 52829 /usr/lib/i386-linux-gnu/libgio-2.0.so.0.3000.0
00924000-00925000 rw-p 00144000 07:00 52829 /usr/lib/i386-linux-gnu/libgio-2.0.so.0.3000.0
00925000-00926000 rw-p 00000000 00:00 0
00926000-00943000 r-xp 00000000 07:00 53019 /usr/lib/i386-linux-gnu/libatk-1.0.so.0.20209.1
00943000-00945000 r--p 0001c000 07:00 53019 /usr/lib/i386-linux-gnu/libatk-1.0.so.0.20209.1
00945000-00946000 rw-p 0001e000 07:00 53019 /usr/lib/i386-linux-gnu/libatk-1.0.so.0.20209.1
00946000-00964000 r-xp 00000000 07:00 52267 /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0.2400.0
00964000-00965000 r--p 0001d000 07:00 52267 /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0.2400.0
00965000-00966000 rw-p 0001e000 07:00 52267 /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0.2400.0
00966000-00991000 r-xp 00000000 07:00 52696 /usr/lib/i386-linux-gnu/libpangoft2-1.0.so.0.2903.0
00991000-00992000 r--p 0002a000 07:00 52696 /usr/lib/i386-linux-gnu/libpangoft2-1.0.so.0.2903.0
00992000-00993000 rw-p 0002b000 07:00 52696 /usr/lib/i386-linux-gnu/libpangoft2-1.0.so.0.2903.0
00993000-009c5000 r-xp 00000000 07:00 52669 /usr/lib/i386-linux-gnu/libfontconfig.so.1.4.4
009c5000-009c6000 ---p 00032000 07:00 52669 /usr/lib/i386-linux-gnu/libfontconfig.so.1.4.4
009c6000-009c7000 r--p 00032000 07:00 52669 /usr/lib/i386-linux-gnu/libfontconfig.so.1.4.4
009c7000-009c8000 rw-p 00033000 07:00 52669 /usr/lib/i386-linux-gnu/libfontconfig.so.1.4.4
009c8000-009c9000 r-xp 00000000 07:00 43907 /usr/lib/ubiquity/ubiquity/_osextras.so
009c9000-009ca000 r--p 00000000 07:00 43907 /usr/lib/ubiquity/ubiquity/_osextras.so
009ca000-009cb000 rw-p 00001000 07:00 43907 /usr/lib/ubiquity/ubiquity/_osextras.so
009cb000-009dc000 r-xp 00000000 07:00 52713 /usr/lib/i386-linux-gnu/libXext.so.6.4.0
009dc000-009dd000 r--p 00010000 07:00 52713 /usr/lib/i386-linux-gnu/libXext.so.6.4.0
009dd000-009de000 rw-p 00011000 07:00 52713 /usr/lib/i386-linux-gnu/libXext.so.6.4.0
009de000-009fb000 r-xp 00000000 07:00 52904 /usr/lib/i386-linux-gnu/libxcb.so.1.1.0
009fb000-009fc000 r--p 0001c000 07:00 52904 /usr/lib/i386-linux-gnu/libxcb.so.1.1.0
009fc000-009fd000 rw-p 0001d000 07:00 52904 /usr/lib/i386-linux-gnu/libxcb.so.1.1.0
009fd000-00a05000 r-xp 00000000 07:00 52957 /usr/lib/i386-linux-gnu/libxcb-render.so.0.0.0
00a05000-00a06000 r--p 00007000 07:00 52957 /usr/lib/i386-linux-gnu/libxcb-render.so.0.0.0
00a06000-00a07000 rw-p 00008000 07:00 52957 /usr/lib/i386-linux-gnu/libxcb-render.so.0.0.0
00a07000-00a10000 r-xp 00000000 07:00 53048 /usr/lib/i386-linux-gnu/libXrender.so.1.3.0
00a10000-00a11000 r--p 00008000 07:00 53048 /usr/lib/i386-linux-gnu/libXrender.so.1.3.0
00a11000-00a12000 rw-p 00009000 07:00 53048 /usr/lib/i386-linux-gnu/libXrender.so.1.3.0
00a12000-00a5f000 r-xp 00000000 07:00 53070 /usr/lib/i386-linux-gnu/libgobject-2.0.so.0.3000.0
00a5f000-00a60000 r--p 0004d000 07:00 53070 /usr/lib/i386-linux-gnu/libgobject-2.0.so.0.3000.0
00a60000-00a61000 rw-p 0004e000 07:00 53070 /usr/lib/i386-linux-gnu/libgobject-2.0.so.0.3000.0
00a61000-00a63000 r-xp 00000000 07:00 53051 /usr/lib/i386-linux-gnu/libXau.so.6.0.0
00a63000-00a64000 r--p 00001000 07:00 53051 /usr/lib/i386-linux-gnu/libXau.so.6.0.0
00a64000-00a65000 rw-p 00002000 07:00 53051 /usr/lib/i386-linux-gnu/libXau.so.6.0.0
00a65000-00a6a000 r-xp 00000000 07:00 53073 /usr/lib/i386-linux-gnu/libXdmcp.so.6.0.0
00a6a000-00a6b000 r--p 00004000 07:00 53073 /usr/lib/i386-linux-gnu/libXdmcp.so.6.0.0
00a6b000-00a6c000 rw-p 00005000 07:00 53073 /usr/lib/i386-linux-gnu/libXdmcp.so.6.0.0
00a6c000-00a74000 r-xp 00000000 07:00 23498 /lib/i386-linux-gnu/libnss_compat-2.13.so
00a74000-00a75000 r--p 00007000 07:00 23498 /lib/i386-linux-gnu/libnss_compat-2.13.so
00a75000-00a76000 rw-p 00008000 07:00 23498 /lib/i386-linux-gnu/libnss_compat-2.13.so
00a76000-00a8b000 r-xp 00000000 07:00 23513 /lib/i386-linux-gnu/libnsl-2.13.so
00a8b000-00a8c000 r--p 00015000 07:00 23513 /lib/i386-linux-gnu/libnsl-2.13.so
00a8c000-00a8d000 rw-p 00016000 07:00 23513 /lib/i386-linux-gnu/libnsl-2.13.so
00a8d000-00a8f000 rw-p 00000000 00:00 0
00a8f000-00a99000 r-xp 00000000 07:00 23532 /lib/i386-linux-gnu/libnss_nis-2.13.so
00a99000-00a9a000 r--p 00009000 07:00 23532 /lib/i386-linux-gnu/libnss_nis-2.13.so
00a9a000-00a9b000 rw-p 0000a000 07:00 23532 /lib/i386-linux-gnu/libnss_nis-2.13.so
00a9b000-00a9d000 r-xp 00000000 07:00 52838 /usr/lib/i386-linux-gnu/pango/1.6.0/modules/pango-basic-fc.so
00a9d000-00a9e000 r--p 00001000 07:00 52838 /usr/lib/i386-linux-gnu/pango/1.6.0/modules/pango-basic-fc.so
00a9e000-00a9f000 rw-p 00002000 07:00 52838 /usr/lib/i386-linux-gnu/pango/1.6.0/modules/pango-basic-fc.so
00a9f000-00aa2000 r-xp 00000000 07:00 45667 /usr/lib/libubiwebcam.so.0.0.0
00aa2000-00aa3000 r--p 00002000 07:00 45667 /usr/lib/libubiwebcam.so.0.0.0
00aa3000-00aa4000 rw-p 00003000 07:00 45667 /usr/lib/libubiwebcam.so.0.0.0
00aa4000-00aab000 r-xp 00000000 07:00 23633 /lib/i386-linux-gnu/librt-2.13.so
00aab000-00aac000 r--p 00006000 07:00 23633 /lib/i386-linux-gnu/librt-2.13.so
00aac000-00aad000 rw-p 00007000 07:00 23633 /lib/i386-linux-gnu/librt-2.13.so
00aad000-00af4000 r-xp 00000000 07:00 52722 /usr/lib/i386-linux-gnu/libpango-1.0.so.0.2903.0
00af4000-00af5000 r--p 00047000 07:00 52722 /usr/lib/i386-linux-gnu/libpango-1.0.so.0.2903.0
00af5000-00af6000 rw-p 00048000 07:00 52722 /usr/lib/i386-linux-gnu/libpango-1.0.so.0.2903.0
00af6000-00b01000 r-xp 00000000 07:00 23561 /lib/i386-linux-gnu/libnss_files-2.13.so
00b01000-00b02000 r--p 0000a000 07:00 23561 /lib/i386-linux-gnu/libnss_file