apt repository broken / ubuntu xenail
source.list looks like this
deb http://downloads.skewed.de/apt/xenial xenial universe
deb-src http://downloads.skewed.de/apt/xenial xenial universe
$apt update
Ign http://downloads.skewed.de/apt/xenial xenial Release.gpg
Get: 6 http://downloads.skewed.de/apt/xenial xenial/universe Sources [845 B]
Get: 7 http://downloads.skewed.de/apt/xenial xenial/universe amd64 Packages [774 B]
Get: 8 http://downloads.skewed.de/apt/xenial xenial/universe i386 Packages [776 B]
Fetched 463 kB in 1s (315 kB/s)
W: GPG error: http://downloads.skewed.de/apt/xenial xenial Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78AF38AD52B46290
W: The repository 'http://downloads.skewed.de/apt/xenial xenial Release' is not signed.
Edited by Tiago Peixoto