The error in your log is:
Processing triggers for plymouth-theme-ubuntu-text (0.9.3-1ubuntu7) ...
update-initramfs: deferring update (trigger activated)
cp: cannot create regular file '/cdrom/casper/initrd.gz.new': No such file or
directory
dpkg: error processing package plymouth-theme-ubuntu-text (--configure):
installed plymouth-theme-ubuntu-text package post-installation script
subprocess returned error exit status 1
Why is casper involved here? Casper is only used for live images, and
your bug report claims to come from an installed system.
** Changed in: plymouth (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1791402
Title:
package plymouth-theme-ubuntu-text 0.9.3-1ubuntu7 failed to
install/upgrade: installed plymouth-theme-ubuntu-text package post-
installation script subprocess returned error exit status 1
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