Hello,

I've been getting, for quite a long time, the following sort of Badsig messages (several of them) when updating.

I read several threads here & none helped. I also followed this: http://blog.drewwithers.com/2009/12/...or-badsig.html

& what it did is change the errors to:

Code:
W: GPG error: http://debs.slavino.sk testing Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EC3068F0E9C5D7EF
W: Failed to fetch cdrom://Ubuntu 11.04 _Natty Narwhal_ - Release i386 (20110427.1)/dists/natty/main/binary-i386/Packages.gz  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

W: Failed to fetch cdrom://Ubuntu 11.04 _Natty Narwhal_ - Release i386 (20110427.1)/dists/natty/restricted/binary-i386/Packages.gz  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs

W: Failed to fetch http://deb.opera.com/opera/dists/stable/non-free/binary-i386/Packages.gz  Sub-process gzip returned an error code (1)

W: Failed to fetch http://www.geekconnection.org/remastersys/repository/karmic/Packages.gz  Sub-process gzip returned an error code (1)

E: Some index files failed to download, they have been ignored, or old ones used instead.
Help is greatly appreciated