Yes the kernel log (CurrentDmesg.txt) suggests a disk is faulty so you should replace that before doing anything else...
Then if the screen flickering persists please attach a video of the problem here so we can better understand what you mean. ** Package changed: xorg (Ubuntu) => ubuntu -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1844609 Title: my screen flickering To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1844609/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp