I got error after
aptitude update command:
Err http://archive.debian.org lenny/non-fre Packages 404 Not Found [IP: 126.96.36.199 80] Fetched 194kB in 6s (31.3kB/s) W: GPG error: http://archive.debian.org lenny Release: The following signatures were invalid: KEYEXPIRED 1520281423 KEYEXPIRED 1337087218 W: GPG error: http://archive.debian.org lenny/updates Release: The following signatures were invalid: KEYEXPIRED 1356982504 W: Failed to fetch http://archive.debian.org/debian-archive/debian/dists/lenny/non-fre/binary-i386/Packages 404 Not Found [IP: 188.8.131.52 80] E: Some index files failed to download, they have been ignored, or old ones used instead.
What does it mean and how to fix that?
deb http://archive.debian.org/debian-archive/debian/ lenny main contrib non-fre deb http://archive.debian.org/debian-security/ lenny/updates main contrib non- free