i have upgraded my ubuntu to feisty but when i update i get this :
gzip: stdin: not in gzip format
Err
http://archive.ubuntu.com feisty/main Packages
Sub-process gzip returned an error code (1)
Fetched 6784kB in 1m15s (89.3kB/s)
Failed to fetch
http://archive.ubuntu.com/ubuntu/dis...86/Packages.gz Sub-process gzip returned an error code (1)
Reading package lists... Done
W: GPG error:
http://archive.ubuntu.com feisty Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: GPG error:
http://security.ubuntu.com feisty-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old ones used instead.
can someone help me with this thing
thanks every one