The PPA https://launchpad.net/~marutter/+archive/ubuntu/c2d4u has not
been updated for Ubuntu 20.04. You should remove that PPA and find an
alternative source for these or similar packages. After removing the PPA
updating should proceed without error.

This is not a bug but simply an error message telling you that your
system is trying to get information about packages for Ubuntu 20.04 that
do not exist.

** Tags added: focal

** Changed in: ubuntu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1898806

Title:
  I get an error when I try to install R in Ubuntu 20.04.1 LTS  How can
  I fix it?

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