Comment 17 for bug 1080701

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Bryce Harrington (bryce) wrote : Re: After 'Preparing to install Ubuntu' screen, raring installation hangs with 'ubuntu partman: No matching physical volumes found'

Further experimentation, I reinstalled the system from scratch.

0. Insert precise Live USB stick and boot either directly or via live session
1. Install 12.04, using "Something Else" and partitioning as follows:
    /dev/sda1 20G /
    /dev/sda2 20G swap
    /dev/sda3 100G /var/cache/foobar
    /dev/sda4 EXTENDED
    /dev/sda5 20G [formatted, but no mount point]
    (The system has a 320G hard drive, so this leaves ample remaining unpartitioned space.)
2. Reboot into precise 12.04.
    * Verify partition /dev/sda3 mounted

3. Insert raring Live USB stick, and reboot
4. Go to Live session
5. Launch ubiquity to begin installation
6. Hangs after selecting Continue from 'Preparing to install Ubuntu'
7. Quit ubiquity

8. Run `df /dev/sda` or your favorite partition manager, and delete partitions 3, 4, and 5. (I tried deleting only partitions 4 and 5, but it'd still hang.) Then run partprobe as suggested.
9. Launch ubiquity again
10. This time it allows progressing to the partition manager.