Trouble with apt — "The list of sources could not be read"

af flag

I am using Ubuntu 20.04.3 LTS.

~ sudo apt update
E: Conflicting values set for option Signed-By regarding source focal: /usr/share/keyrings/kitware-archive-keyring.gpg !=
E: The list of sources could not be read.

As a total newbie, I have no idea what to do. Any guidance would be most appreciated. Hopefully, a similar question has been asked in the past and one of you can kindly link to it. My search for duplicates was not very successful.

Knud Larsen avatar
by flag : If you really think you still need this cmake repo, please run the script ``
af flag
@KnudLarsen Thank you. If I recall correctly, I had the same error message when I tried to run the script ``. Eventually, I managed to solve the problem.
af flag

Finally, I solved the problem by commenting the following line in file /etc/apt/sources.list.

deb [signed-by=/usr/share/keyrings/kitware-archive-keyring.gpg] focal main # disabled on upgrade to focal

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