Error installing FAH through command line (Ubuntu)

[zachThePerson]

I'm running a headless server, and after downloading all three 7.5 files (Client, Control, and Viewer), I run

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sudo dpkg -i --force-depends fahclient_7.5.1_amd64.deb

but I get the following errors:

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(Reading database ... 208386 files and directories currently installed.)
Preparing to unpack fahclient_7.5.1_amd64.deb ...
usermod: no changes
Unpacking fahclient (7.5.1) over (7.5.1) ...
Setting up fahclient (7.5.1) ...
update-rc.d: error: no runlevel symlinks to modify, aborting!
dpkg: error processing package fahclient (--install):
 installed fahclient package post-installation script subprocess returned error exit status 1
Processing triggers for systemd (237-3ubuntu10.33) ...
Processing triggers for ureadahead (0.100.0-21) ...
Processing triggers for desktop-file-utils (0.23-1ubuntu3.18.04.2) ...
Processing triggers for gnome-menus (3.13.3-11ubuntu1.1) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Errors were encountered while processing:
 fahclient

I tried re-downloading, but it didn't seem to help.

[Hagnard]

Had similar problem, from another post on this forum I got the advice to run

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sudo update-rc.d FAHClient defaults

before installing, worked for me.

[zachThePerson]

Yep, worked perfectly, thanks!