See the following links for further updates to Github Desktop for Ubuntu. These are official instructions. (also mentioned by fetwar on Nov 3, 2023)
For the sake of "maintaining the tradition" here is the updated version.
# UPDATE (2024-01-24)
## Direct copy-paste from official instrubtions
## Github Desktop for Ubuntu
## Get the @shiftkey package feed
wget -qO - https://apt.packages.shiftkey.dev/gpg.key | gpg --dearmor | sudo tee /usr/share/keyrings/shiftkey-packages.gpg > /dev/null
sudo sh -c 'echo "deb [arch=amd64 signed-by=/usr/share/keyrings/shiftkey-packages.gpg] https://apt.packages.shiftkey.dev/ubuntu/ any main" > /etc/apt/sources.list.d/shiftkey-packages.list'
## Install Github Desktop for Ubuntu
sudo apt update && sudo apt install github-desktopThere are other methods mentioned in the comments. Many thanks to their contributions.
- Meliyio commented on Dec 9, 2023
- phanect commented on Nov 19, 2023
- rakkarage commented on Nov 17, 2023
# UPDATE (2022-11-07): Thanks to Sxvxgee's message, the updated code is as follows
sudo wget https://github.com/shiftkey/desktop/releases/download/release-3.1.1-linux1/GitHubDesktop-linux-3.1.1-linux1.deb
### Uncomment below line if you have not installed gdebi-core before
# sudo apt-get install gdebi-core
sudo gdebi GitHubDesktop-linux-3.1.1-linux1.deb
# UPDATE (2021-10-18): Thanks to Amin Yahyaabadi's message, the updated code is as follows
#sudo wget https://github.com/shiftkey/desktop/releases/download/release-2.9.3-linux3/GitHubDesktop-linux-2.9.3-linux3.deb
### Uncomment below line if you have not installed gdebi-core before
# sudo apt-get install gdebi-core
#sudo gdebi GitHubDesktop-linux-2.9.3-linux3.deb
# UPDATE (2021-03-05): Thanks to PaoloRanzi81's comment, the updated code is as follows https://gist.github.com/PaoloRanzi81
#sudo wget https://github.com/shiftkey/desktop/releases/download/release-2.6.3-linux1/GitHubDesktop-linux-2.6.3-linux1.deb
### Uncomment below line if you have not installed gdebi-core before
# sudo apt-get install gdebi-core
#sudo gdebi GitHubDesktop-linux-2.6.3-linux1.deb
## Initial post
#sudo wget https://github.com/shiftkey/desktop/releases/download/release-2.1.0-linux1/GitHubDesktop-linux-2.1.0-linux1.deb
#sudo gdebi GitHubDesktop-linux-2.1.0-linux1.deb
bad cert?
https://apt.packages.shiftkey.dev/gpg.key