# Warning "Unable to extract mainline kernel"
**URL:** https://forum.yunohost.org/t/warning-unable-to-extract-mainline-kernel/42392
**Category:** Support
**Tags:** starting-kernel, english
**Created:** [June 2, 2026, 7:01am UTC](https://forum.yunohost.org/t/warning-unable-to-extract-mainline-kernel/42392 "2026-06-02T07:01:49Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@mouse](https://forum.yunohost.org/u/mouse)
#### Post date: [June 2, 2026, 7:01am UTC](https://forum.yunohost.org/t/warning-unable-to-extract-mainline-kernel/42392/1 "2026-06-02T07:01:49Z")
**What type of hardware are you using** : Other ARM board
**What YunoHost version are you running** : 12.1.40.1
**How are you able to access your server** : The webadmin
**Are you in a special context or did you perform specific tweaking on your YunoHost instance ?** : no
### Describe your issue
since doing a system update for recent security issues, i received this warning:
`Unable to extract mainline kernel version from the kernel info '#2 SMP PREEMPT Wed Feb 11 12:42:01 UTC 2026' ... Therefore YunoHost will be unable to check for security issues related to the kernel. Please try to report this message to the YunoHost team to improve the situation`
### Share relevant logs or error messages
not sure if there’s a log i can share? happy to if needed…
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### Author:  [@frisur](https://forum.yunohost.org/u/frisur)
#### Post date: [June 21, 2026, 5:47pm UTC](https://forum.yunohost.org/t/warning-unable-to-extract-mainline-kernel/42392/2 "2026-06-21T17:47:48Z")
you could check your kernel release with
`cat /proc/sys/kernel/osrelease`
or maybe
`uname -r`
it seems diagnostics have slight issue
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### Author:  [@Aleks](https://forum.yunohost.org/u/Aleks)
#### Post date: [June 23, 2026, 10:01pm UTC](https://forum.yunohost.org/t/warning-unable-to-extract-mainline-kernel/42392/3 "2026-06-23T22:01:13Z")
> [@mouse](#):
>
> **What type of hardware are you using** : Other ARM board
Can you elaborate which board exactly ?
Also I assume you used an armbian image for the install ?
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### Author:  [@mouse](https://forum.yunohost.org/u/mouse)
#### Post date: [June 25, 2026, 12:19pm UTC](https://forum.yunohost.org/t/warning-unable-to-extract-mainline-kernel/42392/4 "2026-06-25T12:19:15Z")
hi aleks & ynh.
i’m running via armbian image, yes, and my board is a rockchip64 from pine64, i think this one: [ROCKPro64 - PINE64](https://pine64.org/devices/rockpro64/).
calling `cat /proc/sys/kernel/osrelease` outputs: `6.18.10-current-rockchip64`
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### Author:  [@lote](https://forum.yunohost.org/u/lote)
#### Post date: [July 2, 2026, 2:04am UTC](https://forum.yunohost.org/t/warning-unable-to-extract-mainline-kernel/42392/5 "2026-07-02T02:04:39Z")
I’m all so dealing with this on a RPi4
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### Author:  [@monoprix](https://forum.yunohost.org/u/monoprix)
#### Post date: [July 16, 2026, 6:58pm UTC](https://forum.yunohost.org/t/warning-unable-to-extract-mainline-kernel/42392/6 "2026-07-16T18:58:52Z")
Hi, just wanted to add that I’m also facing this problem on a RPi4:
```auto
Unable to extract mainline kernel version from the kernel info '#1642 SMP PREEMPT Mon Apr 3 17:24:16 BST 2023' ... Therefore YunoHost will be unable to check for security issues related to the kernel. Please try to report this message to the YunoHost team to improve the situation
```
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### Author:  [@system](https://forum.yunohost.org/u/system)
#### Post date: [August 15, 2026, 6:59pm UTC](https://forum.yunohost.org/t/warning-unable-to-extract-mainline-kernel/42392/7 "2026-08-15T18:59:23Z")
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