If your HP EliteBook Keyboard is not working properly then updating drivers can fix your problem.but this small weird error took my three days and good two nights. i was able to login to my system and then still the keyboard and mouse was working and i checked the graphics card info. Sudo shutdown -r now this is to shutdown and restart. Sudo apt-get update & sudo apt-get upgrade -y
Sudo apt-get install xserver-xorg-input-all Sudo ubuntu-drivers autoinstall #this installed nvidia-418 for me on its own.
asked for login details and this time it did not give me this error:ĮRROR : pam_nologin(8) kind of error. ctrl + d to close root shell and then click clean then dpkg then network and back to root. it asked for login details but nothing worked.ĮRROR : ****** incorrect details. 
reached the root shell and logged in by pressing shift key then selecting advanced option. ***** recovery mode console or terminal is getting of no use. **** now its working only for login and mouse mouse before login only. ***** but now after i login and the account open.the keyboard and mouse again not working. ******rebooted the pc.with init 5 and i was able to login. Sudo add-apt-repository ppa:graphics-drivers/ppa ***** one of the questions even had answer to purge nvidia-* which i did and then said to do I got this same user or team doesnt exist error on many commands. Sudo add-apt-repository ppa:graphics-drivers/ppa *** this gave error.Ĭannot add PPA: 'ppa:~grahics-drivers/ubuntu/ppa'.ĮRROR:'~graphics-drivers' user or team does not exist. Went to recovery mode and then to root shell. 
So i checked and checked for hours online. i mean three days back and started my pc with only ubuntu 18.04 installed. I know there are tons of duplicate questions for this and yes i tried around 20 of them and none or nothing or no command is working. I am on my windows laptop now, THE ISSUE IS IN MY DESKTOP UBUNTU 18.04. i did a lot this time to make it workable according to my work ease " EDIT: just ask me info and i will give it to you.
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