
I still have the same problem !!!!!
I had this error when I ran " apt-get update "
W: GPG error:
ftp://ftp.nerim.net etch Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907
W: You may want to run apt-get update to correct these problems
then when I ran this command I had this message :
user@MEPIS-BOX[~]# apt-get install xine-dvdnav
Reading package lists... Done
Building dependency tree... Done
Package xine-dvdnav 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
However the following packages replace it:
libxine1
E: Package xine-dvdnav has no installation candidate