Se aparecer esta mensagem de erro:

/usr/bin/mandb: can't chmod /var/cache/man/CACHEDIR.TAG: Operation not permitted
/usr/bin/mandb: can't remove /var/cache/man/CACHEDIR.TAG: Permission denied
/usr/bin/mandb: fopen /var/cache/man/1652: Permission denied

Tentar:

cd /var/cache
chgrp root man
chown man man
cd man
chgrp -R root *
chown -R man *

Dica aqui

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