# Unable to Lunch Pritunl

**URL:** <https://forum.pritunl.com/t/unable-to-lunch-pritunl/2334>\
**Category:** Pritunl VPN\
**Created:** [September 4, 2024, 12:43pm UTC](https://forum.pritunl.com/t/unable-to-lunch-pritunl/2334 "2024-09-04T12:43:33Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![ravi](https://forum.pritunl.com/letter_avatar_proxy/v4/letter/r/58956e/32.png) [@ravi](https://forum.pritunl.com/u/ravi)\
**Post date:** [September 4, 2024, 12:43pm UTC](https://forum.pritunl.com/t/unable-to-lunch-pritunl/2334/1 "2024-09-04T12:43:33Z")

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Pritunl - Service Error (6729  
Unable to authenticate communication with background service,  
try restarting computer  
Retry  
Exit

I have Ubuntu 20.04.6 LTS . please provide solution

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**Author:** ![zach](https://forum.pritunl.com/user_avatar/forum.pritunl.com/zach/32/1105_2.png) [@zach](https://forum.pritunl.com/u/zach)\
**Post date:** [September 4, 2024, 8:46pm UTC](https://forum.pritunl.com/t/unable-to-lunch-pritunl/2334/2 "2024-09-04T20:46:59Z")

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Check the service log in `/var/log/pritunl-client.log` and the other logs listed in the [**client debugging**](https://docs.pritunl.com/docs/debugging-client) documentation. Check the status of the service with `sudo systemctl status pritunl-client.service` and logs with `sudo journalctl -u pritunl-client.service`.

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**Author:** ![brbousnguar](https://forum.pritunl.com/user_avatar/forum.pritunl.com/brbousnguar/32/1032_2.png) [@brbousnguar](https://forum.pritunl.com/u/brbousnguar)\
**Post date:** [November 5, 2024, 11:22am UTC](https://forum.pritunl.com/t/unable-to-lunch-pritunl/2334/3 "2024-11-05T11:22:16Z")

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I have the same issue when trying updating the Client to the current version.  
I’m also on Ubuntu 20.04.6 LTS

The service is down and get the following error when checking logs :  
nov. 05 12:13:46 NA-9CMTVL3 ff229b5beccf3475-down.sh[4032629]: Invalid device name: ‘tun0’. Usage: ff229b5beccf3475-down.sh up|down device\_name.

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<div class="post-metadata">

**Author:** ![zach](https://forum.pritunl.com/user_avatar/forum.pritunl.com/zach/32/1105_2.png) [@zach](https://forum.pritunl.com/u/zach)\
**Post date:** [November 5, 2024, 8:54pm UTC](https://forum.pritunl.com/t/unable-to-lunch-pritunl/2334/4 "2024-11-05T20:54:30Z")

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Check the service logs at `/var/log/pritunl-client.log` or with the GUI client in the top right menu.

Also the GUI client is no longer built for 20.04. Only for 24.04 and 24.10, the older versions were discontinued early to move to Node v18 which is not available before 24.04.

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**Author:** ![j2wx](https://forum.pritunl.com/user_avatar/forum.pritunl.com/j2wx/32/1288_2.png) [@j2wx](https://forum.pritunl.com/u/j2wx)\
**Post date:** [June 8, 2025, 5:46pm UTC](https://forum.pritunl.com/t/unable-to-lunch-pritunl/2334/5 "2025-06-08T17:46:28Z")

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I have the same error. `/var/log/pritunl-client.log` is empty. `sudo systemctl status pritunl-client.service` and `sudo journalctl -u pritunl-client.service` doesn’t work since my system doesn’t have systemd.

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<div class="post-metadata">

**Author:** ![zach](https://forum.pritunl.com/user_avatar/forum.pritunl.com/zach/32/1105_2.png) [@zach](https://forum.pritunl.com/u/zach)\
**Post date:** [June 8, 2025, 6:02pm UTC](https://forum.pritunl.com/t/unable-to-lunch-pritunl/2334/6 "2025-06-08T18:02:33Z")

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If systemd isn’t available you will need to manually run `/usr/bin/pritunl-client-service` in the background.