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[GH-ISSUE #4609] Firejail on Kubuntu 21.10 not working (missing SUID bit) #2723

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opened 2026-05-05 09:23:16 -06:00 by gitea-mirror · 6 comments

gitea-mirror commented

2026-05-05 09:23:16 -06:00

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Originally created by @MrFrank17 on GitHub (Oct 16, 2021).
Original GitHub issue: https://github.com/netblue30/firejail/issues/4609

Description

After upgrading from Kubuntu 21.04 to Kubuntu 21.10 firejail is not working anymore

Steps to Reproduce

What I tried so far:
sudo firecfg --clean and sudo firecfg to recreate the symlinks.
However starting a firejailed program, even as firejail --noprofile kate gets me the message:

Error mkdir: util.c:1019 create_empty_dir_as_root: Permission denied

This does not work as well - so maybe something is wrong with the Kubuntu setup? However creating symlinks as root worked beforehand.
firejail --version

Error mkdir: util.c:1019 create_empty_dir_as_root: Permission denied

Thanks!

Originally created by @MrFrank17 on GitHub (Oct 16, 2021). Original GitHub issue: https://github.com/netblue30/firejail/issues/4609 ### Description After upgrading from Kubuntu 21.04 to Kubuntu 21.10 firejail is not working anymore ### Steps to Reproduce What I tried so far: `sudo firecfg --clean` and `sudo firecfg` to recreate the symlinks. However starting a firejailed program, even as `firejail --noprofile kate` gets me the message: > Error mkdir: util.c:1019 create_empty_dir_as_root: Permission denied This does not work as well - so maybe something is wrong with the Kubuntu setup? However creating symlinks as root worked beforehand. `firejail --version` > Error mkdir: util.c:1019 create_empty_dir_as_root: Permission denied Thanks!

gitea-mirror

2026-05-05 09:23:16 -06:00

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gitea-mirror commented

2026-05-05 09:23:20 -06:00

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@rusty-snake commented on GitHub (Oct 16, 2021):

Can you run firejail --noprofile --debug true to see where it dies.

@rusty-snake commented on GitHub (Oct 16, 2021): Can you run `firejail --noprofile --debug true` to see where it dies.

gitea-mirror commented

2026-05-05 09:23:20 -06:00

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@MrFrank17 commented on GitHub (Oct 16, 2021):

Same effect:

firejail --noprofile --debug true kate
Error mkdir: util.c:1019 create_empty_dir_as_root: Permission denied

@MrFrank17 commented on GitHub (Oct 16, 2021): Same effect: > firejail --noprofile --debug true kate Error mkdir: util.c:1019 create_empty_dir_as_root: Permission denied

gitea-mirror commented

2026-05-05 09:23:21 -06:00

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@rusty-snake commented on GitHub (Oct 16, 2021):

If I'm right, this happens at main->preproc_build_firejail_dir->create_empty_dir_as_root.
Has there anything changed in ubu with /run? I don't think so. Sounds more like #4367 maybe. What does ls -l /usr/bin/firejail show?

How did you installed firejail?

@rusty-snake commented on GitHub (Oct 16, 2021): If I'm right, this happens at `main->preproc_build_firejail_dir->create_empty_dir_as_root`. Has there anything changed in ubu with `/run`? I don't think so. Sounds more like #4367 maybe. What does `ls -l /usr/bin/firejail` show? How did you installed firejail?

gitea-mirror commented

2026-05-05 09:23:22 -06:00

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@MrFrank17 commented on GitHub (Oct 16, 2021):

That's the output:

ls -l /usr/bin/firejail -rwxr-xr-x 1 root root 458416 Feb 27 2021 /usr/bin/firejail

I installed it with the old version of the distribution, 21.04 or even before - I guess I used KDE Discover back then

@MrFrank17 commented on GitHub (Oct 16, 2021): That's the output: `ls -l /usr/bin/firejail -rwxr-xr-x 1 root root 458416 Feb 27 2021 /usr/bin/firejail` I installed it with the old version of the distribution, 21.04 or even before - I guess I used KDE Discover back then

gitea-mirror commented

2026-05-05 09:23:22 -06:00

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@rusty-snake commented on GitHub (Oct 16, 2021):

I installed it with the old version of the distribution, 21.04 or even before - I guess I used KDE Discover back then

From the package sources or from the PPA or from the website?

-rwxr-xr-x

https://github.com/netblue30/firejail/issues/4367#issuecomment-914232886

@rusty-snake commented on GitHub (Oct 16, 2021): > I installed it with the old version of the distribution, 21.04 or even before - I guess I used KDE Discover back then From the package sources or from the PPA or from the website? > -rwxr-xr-x https://github.com/netblue30/firejail/issues/4367#issuecomment-914232886

gitea-mirror commented

2026-05-05 09:23:22 -06:00

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@MrFrank17 commented on GitHub (Oct 16, 2021):

From the official Ubuntu repository.

Setting SUID worked!

Thanks

@MrFrank17 commented on GitHub (Oct 16, 2021): From the official Ubuntu repository. Setting SUID worked! Thanks

gitea-mirror referenced this issue

2026-05-05 09:27:52 -06:00

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