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On my computer I divided 50GB for Ubuntu 11.10

I decided to install game Unreal tournament 2004 deb package. After few minutes installation I have a error about "Not enough disk space". Then I abort installation and reboot computer in Windows. Today I try to start my ubuntu, but after change boot OS ubuntu, I see nothing. Black display.

Then in windows programm ext2explore I saw that in Linux there is no free disk space. How can I remove the packages that were installed?

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In normal operation Ubuntu does not utilize a lot of disk space for itself, even with a bunch of packages installed. On a filled 50 GB partition, there are surely some warez you can remove or temporarily move somewhere else.

However there is another option: tune2fs -m 0.5 /path_to/device

From the tune2fs manpage:

-m _reserved-blocks-percentage_

Set the percentage of the filesystem which may only be allocated
by privileged processes.   Reserving some number of filesystem blocks
for use by privileged processes is done to avoid filesystem fragmentation,
and to allow system daemons, such as sys‐logd(8), to continue to function
correctly after non-privileged processes are prevented from writing to the
filesystem.  Normally, the default percentage of reserved blocks is 5%.

So using this command you will lower the the reserved blocks in your example from 2,5 GB to 250 MB, which should suffice to boot Ubuntu again.

Obviously you need to run the command from the Live CD. Put the setting back in place after you fixed your issue(!) with: tune2fs -m 5 /path_to/device

As I said in normal operation Ubuntu does not fill a 50 GB file system to the brim. If that 5 GB and above game was the only large thing that you can remember to put on this file system you might want to investigate here. You can use the graphical disk usage tool that comes with Ubuntu or use a command like this: find -size +1G /path | more

Files over 1 GB in size are very rare in the Ubuntu system. Also take a look into /var/log or the log viewer. Don't just remove the files, try to find out if they have to be that big or what made them grow. If it is a logfile take a look at it. I had one with 30 GB in size due to my KVM switch acting up. Replugging it fixed the issue.

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I understand, but I don't have access to the disk. I run LiveCD, and yes, in nautilus I see my ubuntu disk, but inside was just one folder lost+found. When I try to open this folder, I see error The folder contents could not be displayed. You do not have permissions necessary to view the contents of "lost+found" –  Zhenya Mar 31 '12 at 12:06
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