Comment 3 for bug 863306

Same here... getting the keys doesn't help:

...after an apt-get update...
Fetched 665 B in 45s (14 B/s)
Reading package lists... Done
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://extras.ubuntu.com oneiric Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <email address hidden>

W: GPG error: http://download.virtualbox.org oneiric Release: The following signatures were invalid: BADSIG 54422A4B98AB5139 Oracle Corporation (VirtualBox archive signing key) <email address hidden>
W: GPG error: http://de.archive.ubuntu.com oneiric Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>
W: GPG error: http://de.archive.ubuntu.com oneiric-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email address hidden>
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/oneiric/Release

W: Failed to fetch http://ppa.launchpad.net/jtaylor/keepass/ubuntu/dists/oneiric/main/source/Sources 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/jtaylor/keepass/ubuntu/dists/oneiric/main/binary-amd64/Packages 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/jtaylor/keepass/ubuntu/dists/oneiric/main/binary-i386/Packages 404 Not Found

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

nils@padfoot64:/etc/apt/sources.list.d$ sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 16126D3A3E5C1192 40976EAF437D05B5 54422A4B98AB5139

Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.7GYqfhTLOy --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --recv-keys --keyserver keyserver.ubuntu.com 16126D3A3E5C1192 40976EAF437D05B5 54422A4B98AB5139
gpg: requesting key 3E5C1192 from hkp server keyserver.ubuntu.com
gpg: requesting key 437D05B5 from hkp server keyserver.ubuntu.com
gpg: requesting key 98AB5139 from hkp server keyserver.ubuntu.com
gpg: key 3E5C1192: "Ubuntu Extras Archive Automatic Signing Key <email address hidden>" not changed
gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key <email address hidden>" not changed
gpg: key 98AB5139: "Oracle Corporation (VirtualBox archive signing key) <email address hidden>" not changed
gpg: Total number processed: 3
gpg: unchanged: 3
nils@padfoot64:/etc/apt/sources.list.d$