Ubuntu – What does “No apport report written because MaxReports is reached already” mean

I think the problem is due to a conflict with the lilo package, which appears to be installed on your system. The default boot loader for Ubuntu is Grub2, you probably don't need lilo.

Try sudo apt-get remove lilo. Then try, eg. sudo dpkg --configure initramfs-tools. The error messages should go away.

Not sure if this will help, but perhaps try running sudo apt --fix-broken install Another thing that could be an issue is if there is something else like another apt install $PROGRAM running in the background, preventing access to that directory

EDIT
I think there was some sort of corruption issue with the hplip package. Purging then reinstalling seemed to fix the issue for OP
sudo apt purge '^hplip' and then sudo apt install hplip-data hplip-gui