I am a newbie who recently installed 12.04 LTS on an Acer TravelMate 2301XC notebook (Intel Celeron M320 processor 1.3GHz with 1 GB RAM) and also the XFCE desktop environment. Most apps were running fine. Problems began when I upgraded from 12.04 to 12.10.
At first my problem was having no desktop after logging in, i.e. no Dash or menus anywhere, though I could use keystrokes to access Terminal and even run some apps in their GUIs.
Then Ubuntu stopped recognizing my login password (which I have not changed). When I enter it in the startup window that displays Ubuntu 12.10, the screen goes black, then relaunches the same login prompt. Stuck in a loop.
Here are some example messages:
errors were encountered while processing linux-image-3.5.0-48-generic_3.5.0-48.72_i386.deb Could not resolve 'ca/archive.ubuntu.com' Failed to fetch... You might want to run 'apt-get -f install' to correct these. The following packages have unmet dependencies: linux-image-extra-3.5.0-48-generic : Depends: linux-image-3.5.0-48-generic but it is not installed linux-image-generic : Depends: linux-image-3.5.0-48-generic but it is not installed E: Unmet dependencies. Try using -f.
apt-get -f install, plus various cleanup switches and commands I found, but nothing has worked so far. This has been a test installation, so I'm not concerned about any data loss from reinstalling or other radical measures.
I am still able to access Terminal via Ctrl-Alt-F2 and maybe it's possible to repair the errors from there. Any suggestions appreciated. Thanks.