systemd: Failed to connect to bus: No such file or directory

On Ubuntu and Debian systems, if you attempt to enable the systemd 'onedrive' service as the 'root' user as per these instructions this may fail with the following error:

Failed to connect to bus: No such file or directory

This is not a 'onedrive' bug or client issue, rather than a Ubuntu & Debian systemd issue. If you encounter this issue, the steps below is a workaround for running the systemd service as root.

1. Ensure that the client is 'authorised' and works 100% when as 'root' & using onedrive --synchronize --verbose
2. Enable the service with the following: systemctl enable [email protected]
3. Edit /etc/systemd/system/multi-user.target.wants/[email protected] and update the confdir parameter:

--confdir=/root/.config/onedrive

4. Issue a systemctl daemon-reload
5. Start the service with: systemctl start [email protected]
6. Check the status with: systemctl status [email protected]

root@alex-virtual-machine:~# uname -a
Linux alex-virtual-machine 5.0.0-27-generic #28~18.04.1-Ubuntu SMP Thu Aug 22 03:00:32 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
root@alex-virtual-machine:~# systemctl status [email protected]
â—� [email protected] - OneDrive Free Client for root
   Loaded: loaded (/lib/systemd/system/[email protected]; indirect; vendor preset: enabled)
   Active: active (running) since Tue 2019-09-17 06:48:54 AEST; 8min ago
     Docs: https://github.com/abraunegg/onedrive
 Main PID: 1906 (onedrive)
    Tasks: 2 (limit: 2302)
   CGroup: /system.slice/system-onedrive.slice/[email protected]
           └─1906 /usr/local/bin/onedrive --monitor --confdir=/root/.config/onedrive

Sep 17 06:56:44 alex-virtual-machine onedrive[1906]: Deleting item from OneDrive: random_files/ILg9AFI0BLiE1TwT3fK4j0atyyKyZNd3/file0.data
Sep 17 06:56:44 alex-virtual-machine onedrive[1906]: Deleting item from OneDrive: random_files/ILg9AFI0BLiE1TwT3fK4j0atyyKyZNd3/file2.data
Sep 17 06:56:44 alex-virtual-machine onedrive[1906]: Deleting item from OneDrive: random_files/ILg9AFI0BLiE1TwT3fK4j0atyyKyZNd3/file8.data
Sep 17 06:56:44 alex-virtual-machine onedrive[1906]: Deleting item from OneDrive: random_files/ILg9AFI0BLiE1TwT3fK4j0atyyKyZNd3/file9.data
Sep 17 06:56:45 alex-virtual-machine onedrive[1906]: Deleting item from OneDrive: random_files/ILg9AFI0BLiE1TwT3fK4j0atyyKyZNd3/file3.data
Sep 17 06:56:45 alex-virtual-machine onedrive[1906]: Deleting item from OneDrive: random_files/ILg9AFI0BLiE1TwT3fK4j0atyyKyZNd3/file5.data
Sep 17 06:56:46 alex-virtual-machine onedrive[1906]: Deleting item from OneDrive: random_files/ILg9AFI0BLiE1TwT3fK4j0atyyKyZNd3/file1.data
Sep 17 06:56:46 alex-virtual-machine onedrive[1906]: Deleting item from OneDrive: random_files/ILg9AFI0BLiE1TwT3fK4j0atyyKyZNd3/file4.data
Sep 17 06:56:47 alex-virtual-machine onedrive[1906]: Deleting item from OneDrive: random_files/ILg9AFI0BLiE1TwT3fK4j0atyyKyZNd3
Sep 17 06:56:47 alex-virtual-machine onedrive[1906]: Deleting item from OneDrive: ./random_files
root@alex-virtual-machine:~#