What to do with error : ERROR: failed to lock directory ‘/usr/local/lib/R/site-library’ for modifying

Just after this advice appears:

Try removing ‘/usr/local/lib/R/site-library/00LOCK-quantreg’


Then I did:
cd /usr/local/lib/R/site-library/
sudo rm -rf 00LOCK-quantreg

And I could install the package


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