# Client issue to connect to docker install on Ubuntu 26.04 - solved!

**URL:** <https://minarca.discourse.group/t/client-issue-to-connect-to-docker-install-on-ubuntu-26-04-solved/17>\
**Category:** General\
**Created:** [August 10, 2026, 9:59am UTC](https://minarca.discourse.group/t/client-issue-to-connect-to-docker-install-on-ubuntu-26-04-solved/17 "2026-08-10T09:59:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Wanni48](https://yyz1.discourse-cdn.com/flex047/user_avatar/minarca.discourse.group/wanni48/32/18_2.png) [@Wanni48](https://minarca.discourse.group/u/Wanni48)\
**Post date:** [August 10, 2026, 9:59am UTC](https://minarca.discourse.group/t/client-issue-to-connect-to-docker-install-on-ubuntu-26-04-solved/17/1 "2026-08-10T09:59:22Z")

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The docker install went fine. However I was not able to get any client to connect to the server. With latest Ubuntu there is some issue with apparmor. To overcome this you have to overwrite the default “restricted\_unprivileged\_user” being “1”. Here my solution:

sudo tee /etc/sysctl.d/99-minarca-server-userns.conf \<\<EOF  
kernel.unprivileged\_userns\_clone=1  
kernel.apparmor\_restrict\_unprivileged\_userns=0  
EOF

You have to name the file with something higher than what you find in the sysctl.d directory to ensure its overwriting any previous settings (which was in my case, until i rename it with a higher number)

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**Author:** ![ikus060](https://yyz1.discourse-cdn.com/flex047/user_avatar/minarca.discourse.group/ikus060/32/28_2.png) [@ikus060](https://minarca.discourse.group/u/ikus060)\
**Post date:** [August 10, 2026, 11:41am UTC](https://minarca.discourse.group/t/client-issue-to-connect-to-docker-install-on-ubuntu-26-04-solved/17/2 "2026-08-10T11:41:34Z")

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> [@Wanni48](#):
>
> sudo tee /etc/sysctl.d/99-minarca-server-userns.conf \<\<EOF  
> kernel.unprivileged\_userns\_clone=1  
> kernel.apparmor\_restrict\_unprivileged\_userns=0  
> EOF

It’s clearly something that need to be better documented. I will take a not in Gitlab issue tracking to improve documentation for Ubuntu + Docker.

Thanks for sharing this info.

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<div class="post-metadata">

**Author:** ![ikus060](https://yyz1.discourse-cdn.com/flex047/user_avatar/minarca.discourse.group/ikus060/32/28_2.png) [@ikus060](https://minarca.discourse.group/u/ikus060)\
**Post date:** [August 14, 2026, 5:30pm UTC](https://minarca.discourse.group/t/client-issue-to-connect-to-docker-install-on-ubuntu-26-04-solved/17/3 "2026-08-14T17:30:06Z")

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@Wanni48 A new section docuemnt this here

> **[kernel.apparmor\_restrict\_unprivileged\_userns - Server Installation Guide —...](https://nexus.ikus-soft.com/repository/archive/minarca/7.1.1/doc/installation.html#enabling-on-ubuntu-debian)**
>
> Minarca relies on unprivileged user namespaces to isolate SSH connections and backups from one another, ensuring security and system integrity.

And also in docker readme file

> **[ikus060/minarca-server - Docker Image](https://hub.docker.com/r/ikus060/minarca-server#%EF%B8%8F-important-enabling-nested-containers-and-unprivileged-user-namespaces)**