Get:30 http://ppa.launchpad.net/x2go/stable/ubuntu xenial/main i386 Packages [15,7 kB]
Get:31 http://ppa.launchpad.net/x2go/stable/ubuntu xenial/main Translation-en [8780 B]
Fetched 1555 kB in 6s (231 kB/s)                                               
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/ubuntuhandbook1/audacity/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: http://download.ebz.epson.net/dsc/op/stable/debian/dists/lsb3.2/Release.gpg: Signature by key E5220FB7014D0FBDA50DFC2BE5E86C008AA65D56 uses weak digest algorithm (SHA1)
E: Failed to fetch http://ppa.launchpad.net/ubuntuhandbook1/audacity/ubuntu/dists/xenial/main/binary-i386/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.