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Press Alt+PrtSc and while holding on these two keys type REISUB. for more information you can found you answer here.


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You didn't say how much RAM your computer has. If you are trying to run Ubuntu on a computer that has less than 1GB RAM, then there is your problem. Depending on how much RAM you have, there are different *buntu editions that are compatible with your hardware, even if your computer has only 128MB RAM. Please comment if this is an issue. Visual artifacts ...


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Try installing chromium its a open source version of chrome that works just as well. It just has different icons. You can download chrome apps and the bookmarks link.


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Run Chrome from a terminal with the flag --disable-gpu google-chrome --disable-gpu Then select: Options - Settings - Show Advanced Settings Under the System heading, uncheck "Use hardware acceleration when available" and restart the browser.


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Passing a reboot= parameter to the kernel can solve this issue, no matter which shutdown command is used. See http://linux.koolsolutions.com/2009/08/04/howto-fix-linux-hangfreeze-during-reboots-and-restarts/ for more details. In my case, reboot=pci fixed the problem for a Dell Optiplex 790.


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Ubuntu is too heavy for this old computer. I would suggest installing Lubuntu 14.04. 1 GB of RAM is just enough. And Ubuntu graphical effects drain all CPU and GPU resources. Minimal requirements just let OS start and work some way. They do not guarantee any comfortable work.


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I was experiencing freezing using 15.04. I tried the additional drivers and it did not fix. Then booted up after a freeze, went straight into the software center and simply installed all the available Nvidia software through the software center. After that, great performance everything worked nicely. Set server preference to performance, not high quality.


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This is fairly old, but I thought I'd reopen this, with a possible but report in the making. I oversee a fairly large network on which we have many users who access a central LTSP server. Lately, we've noticed slowdowns and unintended log-offs when users take screenshots. Looking at top -0 %MEM, there are some xfce4-screenshooter processes taking fairly ...


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First, try to boot with a liveUSB or LiveCD to discard any hardware malfunction. If the system on the live media boot and you can access your disk, go to /var/log/boot.log and check for any problem or error. You can also check the other log files and look for more errors. If the live image does not boot, remove it, and reboot your computer, then, when the ...


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Try to disable in Google Chrome the "Use hardware acceleration when available" and check if you have a better experience. It's not a solution, but at least a workaround. It did the trick for me.



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