Public bug reported:
When thumbnails are being generated in Nemo, I keep seeing "WARNING:
Glycin running without sandbox." output to the console which started
Nemo for each thumbnail. I don't know why this is happening.
kernel.unprivileged_userns_clone is already set to 1 and bwrap seems to
work fine. Disabling AppArmor doesn't stop the messages. Thumbnails are
being generated successfully, and this only seems to make thumbnail
generation less secure.
Note that when cached thumbnails are being used, this message does not
appear. You can make a copy of a directory with images to trigger the
issue as thumbnails are generated for the copy.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: nemo 6.4.5-1build1
ProcVersionSignature: Ubuntu 7.0.0-31.31-generic 7.0.14
Uname: Linux 7.0.0-31-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Mon Sep 14 09:55:25 2026
SourcePackage: nemo
UpgradeStatus: Upgraded to resolute on 2026-07-05 (71 days ago)
** Affects: nemo (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
** Description changed:
When thumbnails are being generated in Nemo, I keep seeing "WARNING:
- Glycin running without sandbox." for each thumbnail. I don't know why
- this is happening. kernel.unprivileged_userns_clone is already set to 1
- and bwrap seems to work fine. Disabling AppArmor doesn't stop the
- messages. Thumbnails are being generated successfully, and this only
- seems to make thumbnail generation less secure.
+ Glycin running without sandbox." output to the console which started
+ Nemo for each thumbnail. I don't know why this is happening.
+ kernel.unprivileged_userns_clone is already set to 1 and bwrap seems to
+ work fine. Disabling AppArmor doesn't stop the messages. Thumbnails are
+ being generated successfully, and this only seems to make thumbnail
+ generation less secure.
Note that when cached thumbnails are being used, this message does not
appear. You can make a copy of a directory with images to trigger the
issue as thumbnails are generated for the copy.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: nemo 6.4.5-1build1
ProcVersionSignature: Ubuntu 7.0.0-31.31-generic 7.0.14
Uname: Linux 7.0.0-31-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Mon Sep 14 09:55:25 2026
SourcePackage: nemo
UpgradeStatus: Upgraded to resolute on 2026-07-05 (71 days ago)
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https://bugs.launchpad.net/bugs/2167243
Title:
"WARNING: Glycin running without sandbox." when generating thumbnails
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