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I got the following error message when trying to update Ubuntu 20.04 with sudo apt update.

Err:27 http://ppa.launchpad.net/me-davidsansome/clementine/ubuntu focal Release
  404  Not Found [IP: 2001:67c:1560:8008::19 80]
Err:28 http://ppa.launchpad.net/mefrio-g/plymouthmanager/ubuntu focal Release
  404  Not Found [IP: 2001:67c:1560:8008::19 80]
Err:29 http://ppa.launchpad.net/vantuz/cool-retro-term/ubuntu focal Release
  404  Not Found [IP: 2001:67c:1560:8008::19 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/me-davidsansome/clementine/ubuntu focal 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/mefrio-g/plymouthmanager/ubuntu focal 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/vantuz/cool-retro-term/ubuntu focal 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.
Kulfy
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    You have multiple outdated repositories added. Run `sudo apt-add-repository -r ppa:me-davidsansome/clementine`, `sudo apt-add-repository -r ppa:mefrio-g/plymouthmanager` and finally `sudo apt-add-repository -r ppa:vantuz/cool-retro-term`. Retry running `sudo apt update`. Also, please don't replace the error message text with the screenshot of the terminal unless there's some other error. Photos are slower to load and one cannot copy text from it. – Kulfy Jan 02 '21 at 15:38
  • Thank you very much!! I am new to Ubuntu and this solved my problem. I have few move questions which I cannot find on web and I will post it on here. Thank you so much buddy!! –  Jan 02 '21 at 15:44

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