This is a personal note on the commands for restarting Virtuoso when it stops. There may be some errors, but I hope it serves as a useful reference.

Checking virtuoso-t

which virtuoso-t
> /usr/local/bin/virtuoso-t

Checking the Location of virtuoso.ini

sudo find / -name virtuoso.ini
> ...
> /usr/local/var/lib/virtuoso/db/virtuoso.ini
> ...

Deleting the lck File and Starting

sudo rm -rf /usr/local/var/lib/virtuoso/db/virtuoso.lck
sudo /usr/local/bin/virtuoso-t +configfile /usr/local/var/lib/virtuoso/db/virtuoso.ini