I have two computers. This post is about the 64 bit computer that I was able to upgrade from Xubuntu 15.10 to Xubuntu 16.04LTS.

Everything went well during the upgrade. Then when it finished it gave me a window asking to reboot. I rebooted. The computer did not react the way it normally does when it reboots. This time, the screen went black and the monitor said: 'no input' and it shut off. I waited several minutes and did nothing. At that point I thought the computer was off (but it wasn't) and so hit the power button. This did nothing because the computer was on, and I didn't hold the power button down so it didn't power off. I decided to leave it and came back in a half hour and lo and behold there was my Xubuntu screen and I could see it was the 16.04LTS because it gave me a new background screen. It also had the window up for either logging out, restarting, shutting down, suspending or canceling. I figured to be safe I'd restart right away. So I did and when I did, it went back into that black screen mode where the monitor shut down. This time I didn't touch it for ten minutes--still nothing. (And I would roll the mouse every once in a while to make sure it wasn't the power saver turning the screen black.) I came back in another half hour and it was the same screen that came back after the first half hour passed. (In other words, it was the 16.04LTS screen again.)

Now I tested all kinds of things--the computer works perfectly. However, when I go to turn the computer off (getting the window giving me the options to either log out, restart,shutdown, suspend or cancel) I noticed that when the cursor is not on the window, the cursor becomes a spinning wheel that never stops. When I put the cursor back on the window, the wheel disappears and the arrow returns (and all the above-mentioned buttons are fully functional). So now it appears that my computer works great but if I need to do a restart it will take a half hour or so for it to do so. I have not attempted a full shutdown (which is how I turn it off) yet (for fear of not being able to get back here) but I will attempt it as soon as I finish this post and report back (even if I have to use another computer). Thanks. (Sorry for the novel!)

P.S. In my search for a solution the best link I came across was the below one, but unfortunately it presented no clear-cut solution.

http://ubuntuforums.org/showthread.php?t=1469119

Okay. I'm back on a different computer. When I shut down the troublesome computer (the one in the first post) it shut down super quick (much quicker than it usually does). I gave it maybe a minute and then powered it back up. It started gyrating (the red light blinking) like it normally does for a copoule of minutes, but then, although the power stayed on, the red light quit flashing and the screen just says: 'no input signal.'and now it's been 40 minutes that way.

That computer is my main work computer. It has all kinds of things on it I need for Monday. Anyway, I'd obviously love to get this straightened out by then if anybody knows what might be causing the problem. Thanks.

And I'm tempted to push this lower button (in the ....126 screenshot) because I think it's a re-set button, but I don't know so I don't want to screw things up. I don't know what the cylinder icon or the light bulb icon mean and they are on either side and in the middle of the green and red light., (Someone gave me this computer.)

One last thought: when the computor starts up it shows the information that it is booting up (shows the DDR3 info etc) so I would have an opportunity to tap F2 or F12 for either the BIOS or the boot menu, if either of those things would help.

Attached Thumbnails

 

Okay. It's the next day. I turned the computer on and just like last time, the screen with the DDR3 info. etc. came on but nothing else. I hung around for five minutes and nothing happened. Then I went out for an hour or so. When I came back the screen was on and the computer looked normal. (I'm on it now.) So that was good, but the spinning wheel during shutdown is still there. I noticed though a new red warning-sort of icon in the toolbar and left-clicking on it led to an explanatory window (see attachment 812). (This is my main work computer so I am very nervous about doing anything to lose it again.) Anyway I left clicked on the 'Start package manager' choice (the third line up from the bottom) from the window and it opened Synaptic Package Manager. I was hoping it would give me clear-cut instructions on how to proceed but all I got was the typical Package Manager display. (see attachment 069) I did look around there (and for instance found--under the Edit tab--'Fix broken packages') but found nothing I felt confident enough to try. (Again, especially since this is my main computer I'm being extra careful.)

So I was hoping that with this error message that someone could guide me in terms of what to do. (And 'step by step' instructions are always so helpful.) I'm going to leave the computer on till I hear from somebody.

Thanks!

P.S. Just realized the 'spinning wheel' happens on my other computer during the log out stage (and that computer has not been upgraded and works perfectly), so the spinning wheel is not a clue as to the problem. Thanks.

Attached Thumbnails