Ubuntu hangs on boot after upgrade to 18.04.1
Dear community,
I upgraded from 16.04 to 18.04.1 yesterday. The upgrade process was not smooth - dpkg showed errors when dealing with libgcc1 and libpt2.x. I solved these errors by updating libgcc1 separately and purging libpt2.x and re-doing the upgrade with "sudo apt dist-upgrade". dpkg also showed errors while updating nvidia-340 and redmine. Bug reporting for these two failed. After multiple runs of "sudo apt -f install", "sudo apt update", "sudo apt upgrade", "sudo apt autoremove", and "sudo apt dist-upgrade", the system finally had bionic. The system rebooted twice successfully. However, since morning, the boot process hangs at "Starting plymouth..." and the screen turns blank.
I've tried adding "nomodeset" to the grub to no avail. I've tried updating the system from the recovery menu by logging in to root. But the system fails to start network service. Running "dpkg --configure -a" from the recovery menu does not return any error other than the one corresponding to flashplugin-
The boot process completes and login screen appears only in the kernel 4.4.0-133, but, I can login only to CLI. Attempt to login to GUI fails with a blank screen flashing some message that was too fast for me to read. Accessing log files through "journalctl -xb" shows multiple entries saying "Received SIGRTMIN+20 from PID 314 (plymouthd).".
I'm stuck with a CLI. Please help.
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