I am able to move the mouse cursor around for a bit after sign-in, the system soon freezes - keyboard or mouse does not work. The activity light at front of computer flashes. The only way to bring the system down is by unplugging the power cord.
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hi thank you all for pointing me to a few places.
The shut downs were not unexpected, because I had to pull the power plug many times as nothing seemed to work, not the PC's power switch, the keyboard or the mouse.
I did try the Alt-Sys Req, R,E,I,S,U,B route, it didn't do a thing for me, keyboard seemed to have locked, pulled the power cord again.
I also tried booting into recovery mode. what I saw on the monitor was 'Grub loading ...', then it went away and the monitor became blank. But I did find out Grub was on device /dev/sda1.
As to the fsck tool to check out the integrity of the file system, the procedure is way beyond my level of comprehension.
Soon as I bought up an application (such as Firefox web browser, or Ubuntu Application centre), seconds later the cursor /mouse/keyboard stopped working. But I did manage to get a terminal session and completed sudo apt-get update. The terminal session seemed last a bit longer but eventually the same situation happened.
I also posted another question regarding a problem trying to install Lubuntu 15.04 on the same desktop PC, and I mentioned that I was running Ubuntu 12.04 before prior to trying to upgrade it to either Ubuntu 14.04 or Lubuntu 15.04. Some bright idea!
Anything else I can try?
steve
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