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After selecting "install" on "hardware updates are available" on update window of Ubuntu 12.04 (The line that is under 14 release upgrade prompt) a black screen apeared writing some things that i cannot understand. Please note that I have no idea about software management. How can I return to my previous Ubuntu 12.04 situation?

Dimitris
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    Welcome to askubuntu! Typically you have to click the details button to get the black screen which provides detail on unpacking, configuring and installing packages being done in the background. Is this the black screen you are speaking of? – Elder Geek Jan 30 '15 at 17:06
  • If you accidentally saw a black screen with a ton of incomprehensible gobbledygook but your system works fine there is no need at all to go back to your previous situation! This is normal and happens very seldomly: it only happens when you accidentally click the details button... ;-) – Fabby Feb 01 '15 at 19:53
  • Hi @ElderGeek I think that this is the screen you are describing! But I do nto know how can I reach any (!) button! I cannot see buttons at all! – Dimitris Feb 02 '15 at 17:57
  • Hi @Fabby Can you help to find the DETAILS button? – Dimitris Feb 02 '15 at 17:58
  • I have a series of screens in jpg format that describing what I am seeing but I do not know how to upload them! Any help? – Dimitris Feb 02 '15 at 18:00
  • The only thing I can do is to write something in a raw that starts with: dim@dim-P4i65G:~$_ – Dimitris Feb 02 '15 at 18:08
  • No I can't. I first need to get an update... But when I do, I'll get back to your question (set as favourite already) – Fabby Feb 02 '15 at 20:00
  • @Dimitris you can upload images to imgur.com and provide the links here. – Elder Geek Feb 03 '15 at 14:33
  • @ElderGeek here the sequence of screens that I can see... – Dimitris Feb 03 '15 at 20:58
  • @ElderGeek I think I did something wrong in the previous message. Here is the sequence of screens http://imgur.com/9hXfIHA, http://imgur.com/FtA12B0, http://imgur.com/fAxxWMu, http://imgur.com/GY0eJ7n, http://imgur.com/T9Xx3p2, http://imgur.com/yGO9708 – Dimitris Feb 03 '15 at 21:08
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    @Fabby Yes you are right! I saw the screens that you have posted below. But when all this "spectacle" ended I did not know what to do! You can see the sequence of screens that I am seeing after the "upgrade" on the message to ElderGeek above. The update I did was hardware update, possibly a graphics card update. – Dimitris Feb 03 '15 at 21:42
  • Choose "Run in low graphics just for one session". Then login normally, press [Ctrl][Alt][T] and type sudo lshw -class video and provide a screen-hot of the output... – Fabby Feb 03 '15 at 21:52
  • Your current problem is system running in low graphics mode: see this: http://askubuntu.com/questions/141606/how-to-fix-the-system-is-running-in-low-graphics-mode-error – Elder Geek Feb 04 '15 at 00:12

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Stop worrying!

Apparently when you did a software update you saw this:

Software update

and then you accidentally pressed the Details button, so you saw something like this:

enter image description here

and that is absolutely no problem! Don't worry, as long as you don't press the details button, you will not see any gobbledegook any more!

This is just what happens in the background when your computer does updates and some people (like me) actually like to see this happen when they do software updates! ;-)

Fabby
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    yes may be you are right! This how it was started, but when all this "spectacle" ends I cannot do anything (or precisely I do not know what to do!) Here is the sequence of screens I am seeing: imgur.com/9hXfIHA, imgur.com/FtA12B0, imgur.com/fAxxWMu, imgur.com/GY0eJ7n, imgur.com/T9Xx3p2, imgur.com/yGO9708 – Dimitris Feb 03 '15 at 21:10