unity error

[suresh kumar]

mendem@Genome-ST239:~$ sudo add-apt-repository ppa:unity7maintainers/unity7-desktop
[sudo] password for mendem:
smSorry, try again.
[sudo] password for mendem:
Sorry, try again.
[sudo] password for mendem:
 Testing and experimental packages for Unity-7 desktop
 More info: https://launchpad.net/~unity7maintainers/+archive/ubuntu/unity7-desktop
Press [ENTER] to continue or ctrl-c to cancel adding it

gpg: keybox '/tmp/tmpjks4546u/pubring.gpg' created
gpg: /tmp/tmpjks4546u/trustdb.gpg: trustdb created
gpg: key D4A96E2C184671DE: public key "Launchpad PPA for Unity7 Maintainers Team" imported
gpg: Total number processed: 1
gpg: imported: 1
OK
mendem@Genome-ST239:~$ sudo apt update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://archive.canonical.com/ubuntu zesty InRelease
Ign:3 http://ppa.launchpad.net/mank319/go-for-it/ubuntu zesty InRelease
Hit:4 http://dl.google.com/linux/chrome/deb stable Release
Hit:5 http://mirror.math.ucdavis.edu/ubuntu zesty InRelease
Hit:6 http://ppa.launchpad.net/ricotz/unstable/ubuntu zesty InRelease
Ign:8 http://repo.vivaldi.com/stable/deb stable InRelease
Hit:9 http://mirror.math.ucdavis.edu/ubuntu zesty-updates InRelease
Hit:10 http://repo.vivaldi.com/stable/deb stable Release
Ign:11 http://ppa.launchpad.net/unity7maintainers/unity7-desktop/ubuntu zesty InRelease
Hit:13 http://mirror.math.ucdavis.edu/ubuntu zesty-backports InRelease
Err:14 http://ppa.launchpad.net/mank319/go-for-it/ubuntu zesty Release
  404 Not Found
Hit:15 http://mirror.math.ucdavis.edu/ubuntu zesty-security InRelease
Err:16 http://ppa.launchpad.net/unity7maintainers/unity7-desktop/ubuntu zesty Release
  404 Not Found
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/mank319/go-for-it/ubuntu zesty Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://ppa.launchpad.net/unity7maintainers/unity7-desktop/ubuntu zesty Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
mendem@Genome-ST239:~$

[Adolfo Jayme Barrientos (fitojb)]

It is not clear what you are trying to report here. Is it the 404 error? See https://askubuntu.com/questions/65911/how-can-i-fix-a-404-error-when-using-a-ppa-or-updating-my-package-lists