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Tiap selesai menjalankan perintah sudo apt-get update selalu mendapatkan pesan galat :

W: GPG error: http://download.virtualbox.org oneiric Release: The following signatures were invalid: BADSIG 54422A4B98AB5139 Oracle Corporation (VirtualBox archive signing key)
W: GPG error: http://archive.canonical.com oneiric Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ppa.launchpad.net oneiric Release: The following signatures were invalid: BADSIG 2D0F1C05E395A5ED Launchpad PPA for librecad-dev

W: GPG error: http://ppa.launchpad.net natty Release: The following signatures were invalid: BADSIG 8DB7F87A2B97B7B8 Launchpad PPA for Mactel Support
W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures were invalid: BADSIG 27CDF84E4716DAB5 Launchpad PPA for Mixxx Release Managers
W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures were invalid: BADSIG AD6F198CE63C3045 Launchpad test repos
W: Failed to fetch http://ppa.launchpad.net/librecad-dev/librecad-daily/ubuntu/dists/oneiric/Release 

W: Some index files failed to download. They have been ignored, or old ones used instead.

Sebelumnya pernah mengalami hal serupa dan saya selesaikan menggunakan cara terdahulu. Tapi belum menyelesaikan masalah. Setelah mencari informasi sana-sini, akhirnya menemukan caranya dengan menjalan 2 perintah dibawah ini :

sudo rm -r /var/lib/apt/lists
sudo mkdir -p /var/lib/apt/lists/partial