Following the install instructions:
wget -qO- https://cloud.r-project.org/bin/linux/ubuntu/marutter_pubkey.asc | sudo tee -a /etc/apt/trusted.gpg.d/cran_ubuntu_key.asc
sudo add-apt-repository "deb https://cloud.r-project.org/bin/linux/ubuntu impish-cran40/"
sudo update
Then get errors:
E: The repository 'https://cloud.r-project.org/bin/linux/ubuntu impish-cran40/ InRelease' provides only weak security information.
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.
Never had such a problem on Ubuntu 21.10
I've tried to figure out what exactly caused the error message, without success. However, a proper fix is available now that the CRAN maintainers have added a jammy (22.04) repository.
This should upgrade you to the jammy repository:
sudo sed -i -e s/impish/jammy/ /etc/apt/sources.list.d/r-cran.list
Alternatively, using add-apt-repository:
sudo add-apt-repository --remove "deb https://cloud.r-project.org/bin/linux/ubuntu impish-cran40/"
sudo add-apt-repository "deb https://cloud.r-project.org/bin/linux/ubuntu jammy-cran40/"