i am using Linux mint and sometimes i got errors when i am updating the system using apt .
my question is about the letters in the error messages. the letter W or the letter E .. to make my self clear i am not asking about the errors them self, i am only interested in the letters before them

example:
W: GPG error: http://http.us.debian.org stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9AA38DCD55BE302B NO_PUBKEY 4D270D06F42584E6
E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem.

what am i supposed to know from W or E
thanks for your time guys ...

"E:" indicates an error message. Not sure about "W:" though. https://wiki.debian.org/apt-get

ETA: Okay, I think "W:" stands for "warning". So, "E" is Error, and "W" is warning. I got that from the following URL, which indicates that "W" is a warning. If the warning is ignored and a user's action is leading to something more serious, then it will fully spell out "WARNING". See https://wiki.debian.org/SecureApt?hi...es_Release.gpg for an example, wherein it's described as "If you ignore that warning and try to install a package later, apt will warn again: ..."

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Thanks Mark,,, that helped me alot .. finally