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Bookmark or Share- What is "umask" and how does it work? - Ask Ubuntu190. The umask acts as a set of permissions that applications cannot set on files. It's a file mode creation mask for processes and cannot be set for directories itself. Most applications would not create files with execute permissions set, so they would have a default of 666, which is then modified by the umask.
- apache2.service is masked - Ask UbuntuA masked service is used to prevent a unwanted start of this service. If you are sure that Apache2 shouldn't be masked, you can just unmask and then restart your service with: sudo systemctl unmask apache2. sudo service apache2 restart.
- Cannot restart samba, samba.service is masked - Ask UbuntuFailed to restart samba.service: Unit samba.service is masked. This seemed to work at first: smbd restarted properly, no logs or errors, but it was still impossible to connect to samba from another machine. The only thing that worked at the end was to uninstall and reinstall samba.
- 18.04 - Unit systemd-resolved.service is masked - Ask Ubuntuuse the unmask command to unmask any service that is listed in the error, for example: If you get...Unit systemd-networkd.service is masked... then run the command. sudo systemctl unmask systemd-networkd.service (see also this archived answer for ways to list masked services)
- systemd - systemctl, how to unmask - Ask UbuntuIt seems the unmask command fails when there is no existing unit file in the system other than the symlink to /dev/null. If you mask a service, then that creates a new symlink to /dev/null in /etc/systemd/system where systemd looks for unit files to load at boot. In this case, there is no real unit file. Others seem to have similar issues
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