software-center stuck applying changes

Can you reboot then give the output of:

sudo apt-get update; sudo apt-get -y upgrade

Thanks

Could you try this please?
Instead of running Software Center from the icon, could you open a terminal (in the accessories, or by pressing CTRL+ALT+T), type :

software-center

Then try to install a software, and check in the terminal for error messages. Copy paste them here, and we can maybe help.

this's the output of this : sudo apt-get update; sudo apt-get -y upgrade
thanks for help :)

"

Hit http://archive.ubuntu.com maverick Release.gpg
Get:1 http://dl.google.com stable Release.gpg [191B]
Ign http://dl.google.com/linux/chrome/deb/ stable/main Translation-en
Ign http://dl.google.com/linux/chrome/deb/ stable/main Translation-en_US
Get:2 http://dl.google.com stable Release [1,310B]
Ign http://archive.ubuntu.com/ubuntu/ maverick/main Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick/main Translation-en_US
Ign http://archive.ubuntu.com/ubuntu/ maverick/multiverse Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick/multiverse Translation-en_US
Ign http://archive.ubuntu.com/ubuntu/ maverick/restricted Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick/restricted Translation-en_US
Ign http://archive.ubuntu.com/ubuntu/ maverick/universe Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick/universe Translation-en_US
Get:3 http://archive.ubuntu.com maverick-updates Release.gpg [198B]
Ign http://archive.ubuntu.com/ubuntu/ maverick-updates/main Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick-updates/main Translation-en_US
Ign http://archive.ubuntu.com/ubuntu/ maverick-updates/multiverse Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick-updates/multiverse Translation-en_US
Ign http://archive.ubuntu.com/ubuntu/ maverick-updates/restricted Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick-updates/restricted Translation-en_US
Ign http://archive.ubuntu.com/ubuntu/ maverick-updates/universe Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick-updates/universe Translation-en_US
Get:4 http://archive.ubuntu.com maverick-security Release.gpg [198B]
Ign http://archive.ubuntu.com/ubuntu/ maverick-security/main Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick-security/main Translation-en_US
Get:5 http://dl.google.com stable/main i386 Packages [979B]
Ign http://archive.ubuntu.com/ubuntu/ maverick-security/multiverse Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick-security/multiverse Translation-en_US
Ign http://archive.ubuntu.com/ubuntu/ maverick-security/restricted Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick-security/restricted Translation-en_US
Ign http://archive.ubuntu.com/ubuntu/ maverick-security/universe Translation-en
Ign http://archive.ubuntu.com/ubuntu/ maverick-security/universe Translation-en_US
Hit http://archive.ubuntu.com maverick Release
Get:6 http://archive.ubuntu.com maverick-updates Release [31.4kB]
Err http://archive.ubuntu.com maverick-updates Release

Get:7 http://archive.ubuntu.com maverick-security Release [27.2kB]
Hit http://archive.ubuntu.com maverick/main Sources
Hit http://archive.ubuntu.com maverick/restricted Sources
Ign http://archive.ubuntu.com maverick-security Release
Hit http://archive.ubuntu.com maverick/universe Sources
Hit http://archive.ubuntu.com maverick/multiverse Sources
Hit http://archive.ubuntu.com maverick/main i386 Packages
Hit http://archive.ubuntu.com maverick/restricted i386 Packages
Hit http://archive.ubuntu.com maverick/universe i386 Packages
Hit http://archive.ubuntu.com maverick/multiverse i386 Packages
Ign http://archive.ubuntu.com maverick-security/main Sources/DiffIndex
Ign http://archive.ubuntu.com maverick-security/restricted Sources/DiffIndex
Ign http://archive.ubuntu.com maverick-security/universe Sources/DiffIndex
Ign http://archive.ubuntu.com maverick-security/multiverse Sources/DiffIndex
Ign http://archive.ubuntu.com maverick-security/main i386 Packages/DiffIndex
Ign http://archive.ubuntu.com maverick-security/restricted i386 Packages/DiffIndex
Ign http://archive.ubuntu.com maverick-security/universe i386 Packages/DiffIndex
Ign http://archive.ubuntu.com maverick-security/multiverse i386 Packages/DiffIndex
Hit http://archive.ubuntu.com maverick-security/main Sources
Hit http://archive.ubuntu.com maverick-security/restricted Sources
Hit http://archive.ubuntu.com maverick-security/universe Sources
Hit http://archive.ubuntu.com maverick-security/multiverse Sources
Hit http://archive.ubuntu.com maverick-security/main i386 Packages
Hit http://archive.ubuntu.com maverick-security/restricted i386 Packages
Hit http://archive.ubuntu.com maverick-security/universe i386 Packages
Hit http://archive.ubuntu.com maverick-security/multiverse i386 Packages
Fetched 2,878B in 14s (193B/s)
Reading package lists... Done
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.ubuntu.com maverick-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>

W: GPG error: http://archive.ubuntu.com maverick-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/maverick-updates/Release

W: Some index files failed to download, they have been ignored, or old ones used instead.
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
  google-chrome-stable linux-headers-2.6.35-22 linux-headers-2.6.35-22-generic
  linux-image-2.6.35-22-generic linux-libc-dev
5 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 67.6MB of archives.
After this operation, 3,047kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  linux-image-2.6.35-22-generic linux-headers-2.6.35-22
  linux-headers-2.6.35-22-generic linux-libc-dev
E: There are problems and -y was used without --force-yes

"

Ok, I think I understand:

when you download a software to install, the install package is checked to see if it's the real one (and not a fake one containing a virus for instance). To check this, Ubuntu is using signature keys. However, your keys does not seem correct, so ubuntu is just saying "hmmm, I can't check the package validity, it's not very safe to install this".

What you should do is to delete and download the official keys again.
try this:
open the update manager
click on "configuration"
then "authentication" I think
there should be a button to restore the default keys.

François Tissandier
actionparsnip

Thanks u very much.

somehow it works
>>> I restart it to log in with Windows, and when i came back it worked :S

thanks.

welcome !

sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com 40976EAF437D05B5

Will import the key you are missing, you have added a repo but not its key.