Netrunner does not boot

Hello I uninstalled Kubuntu because after installing some files for hardware monitors it stopped booting, it gave me an error at startup, then I formated HDD and installed Netrunner, but now it is giving me the same error once again, it doesn’t allow me enter Netrunner, what could be the problem? maybe the MOBO battery is dying?

Edit: I uninstalled some hp components via sudo apt-get remove libsane, I’m now in Netrunner but There are 8GB files more in the HDD I have less than 15 MEGABYTES and I don’t know why, what could I do? would it be possible caused by a virus?

Edit 2: after running sudo apt-get update I have 2.9 Gb free, what is happening? where are my other 6Gb how could I see that, I have no files in my home folder, nor torrents or anything, I’m confused?

Edit 3: after running sudo apt-get update NOW I have 4.9 Gb free, what is happening? where are my other 6Gb how could I see that, I have no files in my home folder, nor torrents or anything, I’m confused, I have no clue about what’s happening