Comment 2 for bug 790040

Thank you for taking the time to report this issue and help to improve Ubuntu. The errors in the logfile are:

Unpacking replacement ubuntu-sso-client ...
dpkg: error processing /var/cache/apt/archives/plymouth-label_0.8.2-2ubuntu23_i386.deb (--unpack):
 cannot access archive: No such file or directory
dpkg: error processing /var/cache/apt/archives/plymouth_0.8.2-2ubuntu23_i386.deb (--unpack):
 cannot access archive: No such file or directory
dpkg: error processing /var/cache/apt/archives/libplymouth2_0.8.2-2ubuntu23_i386.deb (--unpack):
 cannot access archive: No such file or directory
Preparing to replace language-selector-gnome 0.33 (using .../language-selector-gnome_0.34.1_all.deb) ...

Missing files in /var/cache/apt are not bugs in the named packages. There may be a bug in apt somewhere causing unexpected clean-up of files, or a network error may have prevented the packages from being downloaded as expected; but it's not a bug in plymouth.