hi there.. can someone please help me with my n900, whenever i type apt-get update, it loads until 99% then

Fetched 2115B in 22s (92B/s)
W: GPG error: https://downloads.maemo.nokia.com ./ Release: The following signatures were invalid: KEYEXPIRED 1349249546 KEYEXPIRED 1349249546 KEYEXPIRED 1349249546
W: GPG error: https://downloads.maemo.nokia.com ./ Release: The following signatures were invalid: KEYEXPIRED 1349249546 KEYEXPIRED 1349249546 KEYEXPIRED 1349249546
W: GPG error: https://downloads.maemo.nokia.com ./ Release: The following signatures were invalid: KEYEXPIRED 1349249546 KEYEXPIRED 1349249546 KEYEXPIRED 1349249546
W: Conflicting distribution: http://repository.maemo.org fremantle-1.3 Release (expected fremantle-1.3 but got )
W: Failed to fetch http://repository.maemo.org/extras-t...mantle/Release Unable to find expected entry 1.3/binary-armel/Packages in Meta-index file (malformed Release file?)

E: Some index files failed to download, they have been ignored, or old ones used instead.
/home/user # 


i must success with update to install header then install libc6-dev then install libpcap0.8-dev and libsqlite3-dev and finally, to install wifite.. please help me. where should i start