At the end of the update process, click on the Restart button had no visible effect whatsoever. After waiting 5 to 10 minutes, I decided to reboot the computer manually.
Since then, I rebooted a good dozen times (not with the hope that it would work but with the hope of reading the messages) with the same non-result and the same symptoms:
I get the ASCII text-on-purple
Ubuntu 13.10 . . . .splash screen with these messages:
* Restoring resolver state... [OK] * Starting crash report submission daemon [OK] * Starting CUPS printing spooler/server [OK]Everything disappears.
The whole process hangs at a purple screen with the mouse cursor right in the middle. At this point, I'm unable to use the mouse and the keyboard.
Booting from a 12.04 CD works perfectly, Disk Utility says that all my disks are OK and I can mount my main partition without problems.
Something obviously went wrong at the end of the upgrade but I have no idea what. I'd appreciate any pointer.
This is the kind of moment where you really think "Next time, I'll separate my /home partition for sure".
My machine is an aging but working Dell Inspiron 530 with an Intel Core Duo E2160 processor, 2 GHz of RAM and an ATI Radeon HD3650 video card.
Thanks.
(EDIT)
I had a 12.04 CD in a drawer so I spent the whole day doing the upgrade dance:
12.04 -> 12.10 -> 13.04 -> 13.10
Everything went well during the three first steps but I get the same result after the 13.10 upgrade.