According to your bug report:
NonfreeKernelModules: nvidia
ProcFB: 0 VGA16 VGA
The nvidia binary driver does not provide a true-colour framebuffer. 16-colors
is all you get.
** Changed in: plymouth (Ubuntu)
Status: New => Won't Fix
--
ubuntu-logo theme lacks a 16-color logo for use w
** Attachment added: "BootDmesg.txt"
http://launchpadlibrarian.net/42122692/BootDmesg.txt
** Attachment added: "CurrentDmesg.txt"
http://launchpadlibrarian.net/42122694/CurrentDmesg.txt
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/42122695/Dependencies.txt
** A
