myname@pc:~$ sudo add-apt-repository ppa:go-for-it-team/go-for-it-daily && sudo apt-get update
More info: https://launchpad.net/~go-for-it-team/+archive/ubuntu/go-for-it-daily
Press [ENTER] to continue or ctrl-c to cancel adding it
gpg: keyring `/tmp/tmpzezrbe9d/secring.gpg' created
gpg: keyring `/tmp/tmpzezrbe9d/pubring.gpg' created
gpg: requesting key B485F172 from hkp server keyserver.ubuntu.com
gpg: /tmp/tmpzezrbe9d/trustdb.gpg: trustdb created
gpg: key B485F172: public key "Launchpad PPA for Go for it! team" imported
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
OK
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://dl.google.com/linux/chrome/deb stable Release
Hit:3 http://in.archive.ubuntu.com/ubuntu xenial InRelease
Get:4 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Hit:6 http://ppa.launchpad.net/diodon-team/stable/ubuntu xenial InRelease
Get:7 http://in.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Hit:8 http://ppa.launchpad.net/go-for-it-team/go-for-it-daily/ubuntu xenial InRelease
Hit:9 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu xenial InRelease
Hit:10 http://ppa.launchpad.net/overcoder/hexchat/ubuntu xenial InRelease
Hit:11 http://ppa.launchpad.net/pi-rho/dev/ubuntu xenial InRelease
Ign:12 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial InRelease
Ign:13 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial Release
Get:14 http://in.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Ign:15 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 Packages
Ign:16 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en
Ign:20 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:21 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main DEP-11 64x64 Icons
Ign:15 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 Packages
Ign:16 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en
Ign:20 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:21 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main DEP-11 64x64 Icons
Ign:15 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 Packages
Ign:16 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en
Ign:20 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:21 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main DEP-11 64x64 Icons
Ign:15 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 Packages
Ign:16 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en
Ign:20 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:21 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main DEP-11 64x64 Icons
Ign:15 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 Packages
Ign:16 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en
Ign:20 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:21 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main DEP-11 64x64 Icons
Err:15 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 Packages
404 Not Found
Ign:16 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main i386 Packages
Ign:17 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main all Packages
Ign:18 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en_IN
Ign:19 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main Translation-en
Ign:20 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main amd64 DEP-11 Metadata
Ign:21 http://ppa.launchpad.net/qucs/qucs/ubuntu xenial/main DEP-11 64x64 Icons
Fetched 306 kB in 14s (21.4 kB/s)
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/qucs/qucs/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.
E: Failed to fetch http://ppa.launchpad.net/qucs/qucs/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
myname@pc:~$