Recently I got lots of GPG errors and tried the following methods at various stages:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3E5C1192
sudo apt-get install -reinstall ubuntu-extras-keyring
(For Ubuntu Extras only)
gpg –keyserver keyserver.ubuntu.com –recv 3E5C1192 gpg –export –armor 3E5C1192 | sudo apt-key add - sudo apt-get update
sudo aptitude -o Acquire::http::No-Cache=True -o Acquire::BrokenProxy=true update`
sudo -i apt-get clean cd /var/lib/apt mv lists lists.old mkdir -p lists/partial apt-get clean apt-get update
I again got BADSIG error for extras.ubuntu.com today. So, I'm really at a loss what's causing this error to occur time and again. I really want to solve this problem once and for all.