So I followed this guide to upgrade https://ubuntu.com/blog/how-to-upgrade-from-ubuntu-18-04-lts-to-20-04-lts-today (using the GUI option), and then I just left my laptop do its work since a have an errand to run. When I came back, my laptop's already in login screen, tried to log in but can't seem to go through so I tried to restart. The boot process is unnaturally long, over 15 mins, then it's just white screen showing "Oh no! Something has gone wrong. A problem has occured and the system can't recover. Please contact a system administrator."
Done some research and did everything everyone said, no dice. I tried to boot to recovery and sudo apt-get update, no errors. Then I do sudo apt-get upgrade and it says that dpkg was interrupted and I have to run sudo dpkg --configure --a manually, so I did and I don't see any errors. Tried to reboot and the same message happens.
I'm a newbie in Linux world so any help is appreciated, my hardware is a Acer laptop, Intel CPU with Nvidia graphics card. Thank you.