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Permasalahan
Error ketika update Ubuntu 10.04:

Fetched 5,554B in 27s (200B/s)
Reading package lists... Done
W: GPG error: http://kambing.ui.ac.id lucid Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
W: GPG error: http://ppa.launchpad.net lucid Release: The following signatures were invalid: BADSIG 6E871C4A881574DE Launchpad PPA for Bisigi

Penyelesaian
– Cek jam dan tanggal di system
– Masuk ke ‘root’ dan jalankan perintah berikut:

Code:
# apt-get clean
# cd /var/lib/apt
# mv lists lists.old
# mkdir -p lists/partial
# apt-get clean
# apt-get update