Can't update/upgrade/install packages/cleanup

[cosmikkid]

Hi I have Ubuntu 11.04 and I'm having problems. I can't install any packages, use update manager, or use computer janitor. If I run sudo-apt get update it seems to work ok. If I do sudo apt-get upgrade I get this

Preconfiguring packages ...
(Reading database ... 60%dpkg: unrecoverable fatal error, aborting:
reading files list for package 'linux-headers-2.6.38-11': Input/output error
E: Sub-process /usr/bin/dpkg returned an error code (2)

I've run sudo dpkg --configure -a and it seems to work, although there's no message.
If I try to install a package the installation bar stops half way then a message pops up:

installArchives() failed: Selecting previously deselected package links2.

(Reading database ...
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%dpkg: unrecoverable fatal error, aborting:

reading files list for package 'linux-headers-2.6.38-11': Input/output error

Same as get upgrade. How can I fix this?

[ioanna83]

try to run a fsck, most probably your HDD is going bad, this is what Input/Output errors usually mean

[cosmikkid]

When I try to run fsck it says /dev/
sda1 is mounted and will cause severe damage, as well as /dev/sda5. Is there a check where no damage will be done?

[yancek]

Run it from the Live CD not from an installed system.