Hei guys, Seems like I need your help. Can't go much more further...
Reading package lists... Done W: There is no public key available for the following key IDs: 7638D0442B90D010 W: There is no public key available for the following key IDs: 9D6D8F6BC857C906 W: There is no public key available for the following key IDs: 7638D0442B90D010 Reading package lists... Done Building dependency tree Reading state information... Done Package debian-keyring is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'debian-keyring' has no installation candidate # lsb_release -d Description: Debian GNU/Linux 7.7 (wheezy) any help? -- Best regards, Roman.