The 12.10 64-bit Alternate installer builds from 062212 (and 062312) fails with:
Jun 22 16:54:21 in-target: Some packages could not be installed. This may mean that you have
Jun 22 16:54:21 in-target: requested an impossible situation or if you are using the unstable
Jun 22 16:54:21 in-target: distribution that some required packages have not yet been created
Jun 22 16:54:21 in-target: or been moved out of Incoming.
Jun 22 16:54:21 in-target: The following information may help to resolve the situation:
Jun 22 16:54:21 in-target:
Jun 22 16:54:21 in-target: The following packages have unmet dependencies:
Jun 22 16:54:21 in-target: libavformat53 : Depends: libavcodec53 (>= 4:0.8.3-0ubuntu1) but it is not installable or
Jun 22 16:54:21 in-target: libavcodec-extra-53 (>= 4:0.8.3) but it is not installable
Jun 22 16:54:21 in-target: Depends: libavcodec53 (< 4:0.8.3-99) but it is not installable or
Jun 22 16:54:21 in-target: libavcodec-extra-53 (< 4:0.8.3.99) but it is not installable
Jun 22 16:54:21 in-target: libgegl-0.2-0 : Depends: libavcodec53 (>= 4:0.8-1~) but it is not installable or
Jun 22 16:54:21 in-target: libavcodec-extra-53 (>= 4:0.8-1~) but it is not installable
Jun 22 16:54:21 in-target: E
Jun 22 16:54:21 in-target: :
Jun 22 16:54:21 in-target: Unable to correct problems, you have held broken packages.
Jun 22 16:54:21 in-target:
Jun 22 16:54:21 in-target: tasksel: aptitude failed (100)
Jun 22 16:54:21 main-menu[315]: WARNING **: Configuring 'pkgsel' failed with error code 1
Jun 22 16:54:21 main-menu[315]: WARNING **: Menu item 'pkgsel' failed.
Full syslog from install and screenshot attached.
Yep, this has been broken since the gimp 2.8 merge.
I'll try to upload a new libgegl that doesn't need libav (not sure I'll have time before the alpha, so anyone can steal this work item from me), or drop gimp from the default install.