my ubuntu 16 just completed a routine adjustment of its system files like it often does. it keeps asking me to upgrade to ubuntu 18.04 so i finally gave it permission to do so. this process took over ten hours then it finished with a report that the upgrade had failed. it had been saying that 'systemd' was reporting errors, but it returned me to my usual ubuntu 16 desktop. i started doing a file transfer which i commonly do but the usb drive would not connect. when i tried a reboot, it came up with the red beaver ubuntu 18.04 log on screen with my name in the password entry box, but it fails to accept my password. whenever i put in the password, the screen goes black then the drum error sound plays and it returns to the password entry on the red beaver screen. i can not get anything other than the beaver password entry panel.
i have a complete ubuntu 18.04 set of CD disks which i have used on another computer. can i use it to repair whatever has been lost in this failed upgrade? i do not want to lose all of my data on the harddrive which was created there under under version 16, but this upgrade seems to have lost my password somehow.
