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On xenial (systemd 229), 'systemctl mask NetworkManager' is ineffective;
I can still start the service (and in fact it starts on boot). This may
be due to an interaction with an init.d script with a different name
("network-manager").
root@test-paniikki:~# systemctl is-enabled NetworkManager network-manager
enabled
enabled
root@test-paniikki:~# systemctl mask NetworkManager
Created symlink from /etc/systemd/system/NetworkManager.service to
/dev/null.
root@test-paniikki:~# systemctl is-enabled NetworkManager network-manager
masked
masked
root@test-paniikki:~# systemctl start NetworkManager; echo $?
0
root@test-paniikki:~# systemctl status --no-pager NetworkManager
● NetworkManager.service - Network Manager
Loaded: loaded (/lib/systemd/system/NetworkManager.service; masked;
vendor preset: enabled)
Active: active (running) since Mon 2016-05-23 15:39:09 EEST; 9s ago
Main PID: 6155 (NetworkManager)
Tasks: 6 (limit: 512)
CGroup: /system.slice/NetworkManager.service
├─6155 /usr/sbin/NetworkManager --no-daemon
├─6167 /sbin/dhclient -d -q -sf
/usr/lib/NetworkManager/nm-dhcp-helper -pf /va...
└─6182 /usr/sbin/dnsmasq --no-resolv --keep-in-foreground
--no-hosts --bind-in...
Only if 'network-manager' is also masked will the service fail to start:
root@test-paniikki:~# systemctl mask network-manager
Created symlink from /etc/systemd/system/network-manager.service to
/dev/null.
root@test-paniikki:~# systemctl stop NetworkManager
root@test-paniikki:~# systemctl start NetworkManager
Failed to start NetworkManager.service: Unit NetworkManager.service is
masked.
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: Won't Fix
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masking NetworkManager ineffective without also masking network-manager
https://bugs.launchpad.net/bugs/1584759
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Packages, which is subscribed to network-manager in Ubuntu.
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