Bug#352896: apt-get update: the following signatures couldn't be verified
There is an error in the error message when the signature can't be
verified. This can easily be triggered when running apt-get update when
one of the repositories is signed by a key that is unknown. The warning
message printed says:
W: You may want to run apt-get update to correct these problems.
However, the proper message should say to run apt-KEY.
It would be nice if this message was fixed since the wrong message can
send a new user on a LONG path when the answer is easy to find if
apt-key was mentioned.