root@gw:~# apt-get update
Ign http://debian.ida.liu.se jessie InRelease
Get:1 http://debian.ida.liu.se jessie Release.gpg [2434 B]
Hit http://debian.ida.liu.se jessie Release
Ign http://debian.ida.liu.se jessie Release
Ign http://debian.ida.liu.se jessie/main amd64 Packages/DiffIndex
Hit http://debian.ida.liu.se jessie/main Translation-en
Err http://debian.ida.liu.se jessie/main amd64 Packages

Hit http://debian.ida.liu.se jessie/main amd64 Packages
Fetched 2434 B in 8s (289 B/s)
Reading package lists... Error!
W: GPG error: http://debian.ida.liu.se jessie Release: The following signatures were invalid: BADSIG 8B48AD6246925553 Debian Archive Automatic Signing Key (7.0/wheezy) <ftpmaster@debian.org>
E: Problem parsing dependency Depends
E: Error occurred while processing ruby-remctl (NewVersion2)
E: Problem with MergeList /var/lib/apt/lists/debian.ida.liu.se_debian_dists_jessie_main_binary-amd64_Packages
E: The package lists or status file could not be parsed or opened.
root@gw:~#