Trouble to install R in Ubuntu 20.04

Any idea why am i getting such error? and, how could I fix it?

sudo apt-key adv --keyserver --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9
Executing: /tmp/apt-key-gpghome.QThU5VY9Yd/ --keyserver --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9
gpg: key 51716619E084DAB9: "Michael Rutter <>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1
sudo add-apt-repository 'deb focal-cran40/'
Ign:1 focal InRelease         
Hit:2 stable InRelease      
Hit:3 focal-cran40/ InRelease     
Err:4 focal Release           
  404  Not Found [IP: 80]
Reading package lists... Done
E: The repository ' 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.

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Hi, It looks like the repository list contains a PPA that is not considered as secure one. Try to disable it. So,

Find the list which contains this PPA:

sudo grep -e "" $(find /etc/apt/ -name "*.list")

You will get a path/filename of the repository list containing that PPA. Open this list in your favorite text editor and comment that PPA with # sign. Save the file, exit the editor, and try again to add r-project apt repository.

Let me know how it works, pls.