The system was erased possibly

I was upgrading to version 18.04. Left it to load overnight and when I came home from work it was asking if I wanted to keep my current version, 16.04. All LTS versions. I unplugged the computer (it was fully charged) to bring to a different room and as soon as that happened the screen went purple. It never changed. I tried to restart. Now it can't go past some sort of basic screen where I can select three options Ubuntu(this option doesn't work it takes me to the black screen with the failure codes explained further down) advanced options for ubuntu (I tried selecting recovery mode it's extremely difficult to navigate but I've gotten through a kind of login screen and did a reboot from that login screen to fix the graphics like it told me to only it keeps getting stuck in a black screen that has a bunch of code and the last line is as follows. [ 0.677842] ---end Kernel panic - not syncing: VFS: Unable to mount root 's on unknown-block(0,0)
From this screen I can't move forward or back I have to restart the computer to go back to the screen with three options. The third option is system setup which I can go through but it doesn't do much for me, just computer mumbo jumbo I won't understand. Not code though. Its configuration stuff.

I only have ubuntu because this computer was given to me. I do not even have a basic understanding of it. I used the code do-release-update -d to get the update since my computer kept telling me I had an update forever and every time I clicked update it would have me put in my password and the it just did nothing. The update seemed to work fine in the terminal. Though unplugging the power cord did something even though it has full charge I don't understand it. I know my information is still on the computer because I did logins through some basic version I have no idea how it worked but it really didn't because my cursor isn't even on the screen when I try that. Please someone help me. I have no idea what I'm doing.