Public bug reported:
This started off with LXD
$ sudo snap logs lxd
2026-06-27T20:02:40Z lxd.activate[1269575]: cannot perform operation: mount
--make-slave /tmp/snap.rootfs_u4zWzC/etc/ld.so.cache: Permission denied
2026-06-27T20:02:40Z systemd[1]: snap.lxd.activate.service: Main process
exited, code=exited, status=1/FAILURE
2026-06-27T20:02:40Z systemd[1]: snap.lxd.activate.service: Failed with result
'exit-code'.
2026-06-27T20:02:40Z systemd[1]: Failed to start snap.lxd.activate.service -
Service for snap application lxd.activate.
2026-06-27T20:02:43Z systemd[1]: Starting snap.lxd.activate.service - Service
for snap application lxd.activate...
2026-06-27T20:02:43Z lxd.activate[1269898]: cannot preserve mount namespace of
process 1269882 as lxd.mnt: Permission denied
2026-06-27T20:02:43Z lxd.activate[1269882]: unexpected eof from helper process
2026-06-27T20:02:43Z systemd[1]: snap.lxd.activate.service: Main process
exited, code=exited, status=1/FAILURE
2026-06-27T20:02:43Z systemd[1]: snap.lxd.activate.service: Failed with result
'exit-code'.
2026-06-27T20:02:43Z systemd[1]: Failed to start snap.lxd.activate.service -
Service for snap application lxd.activate.
$ sudo snap changes | tail -15
sudo systemctl stop snap.lxd.activate.service snap.lxd.daemon.service
sudo systemctl restart snapd
sleep 3
sudo systemctl start snap.lxd.activate.service
sudo systemctl status snap.lxd.activate.service --no-pager -l
sudo journalctl -u snap.lxd.activate.service -n 30 --no-pager
ID Status Spawn Ready Summary
641 Done today at 21:44 UTC today at 21:44 UTC Running service command
642 Done today at 21:46 UTC today at 21:46 UTC Running service command
643 Done today at 21:47 UTC today at 21:47 UTC Running service command
644 Done today at 21:49 UTC today at 21:49 UTC Revert "lxd" snap
○ snap.lxd.activate.service - Service for snap application lxd.activate
Loaded: loaded (/etc/systemd/system/snap.lxd.activate.service; disabled;
preset: enabled)
Active: inactive (dead)
Jul 01 22:03:51 skarletsky systemd[1]: snap.lxd.activate.service: Consumed
1.061s CPU time.
Jul 01 22:08:02 skarletsky systemd[1]: Starting snap.lxd.activate.service -
Service for snap application lxd.activate...
Jul 01 22:08:02 skarletsky lxd.activate[1472685]: => Starting LXD activation
Jul 01 22:08:02 skarletsky lxd.activate[1472685]: ==> Loading snap configuration
Jul 01 22:08:02 skarletsky lxd.activate[1472685]: ==> Setting LXD user socket
ownership
Jul 01 22:08:02 skarletsky lxd.activate[1472685]: ==> Checking if LXD needs to
be activated
Jul 01 22:08:02 skarletsky lxd.activate[1472726]: Error: Get
"http://unix.socket/": dial unix /var/snap/lxd/common/lxd/unix.socket: connect:
no such file or directory
Jul 01 22:08:02 skarletsky lxd.activate[1472685]: ====> Activation check
failed, forcing activation
Jul 01 22:08:02 skarletsky systemd[1]: snap.lxd.activate.service: Deactivated
successfully.
Jul 01 22:08:02 skarletsky systemd[1]: Finished snap.lxd.activate.service -
Service for snap application lxd.activate.
Jun 27 20:02:40 skarletsky lxd.activate[1269575]: cannot perform operation:
mount --make-slave /tmp/snap.rootfs_u4zWzC/etc/ld.so.cache: Permission denied
Jun 27 20:02:40 skarletsky systemd[1]: snap.lxd.activate.service: Main process
exited, code=exited, status=1/FAILURE
Jun 27 20:02:40 skarletsky systemd[1]: snap.lxd.activate.service: Failed with
result 'exit-code'.
Jun 27 20:02:40 skarletsky systemd[1]: Failed to start
snap.lxd.activate.service - Service for snap application lxd.activate.
Jun 27 20:02:43 skarletsky systemd[1]: Starting snap.lxd.activate.service -
Service for snap application lxd.activate...
Jun 27 20:02:43 skarletsky lxd.activate[1269898]: cannot preserve mount
namespace of process 1269882 as lxd.mnt: Permission denied
Jun 27 20:02:43 skarletsky lxd.activate[1269882]: unexpected eof from helper
process
Jun 27 20:02:43 skarletsky systemd[1]: snap.lxd.activate.service: Main process
exited, code=exited, status=1/FAILURE
Jun 27 20:02:43 skarletsky systemd[1]: snap.lxd.activate.service: Failed with
result 'exit-code'.
Jun 27 20:02:43 skarletsky systemd[1]: Failed to start
snap.lxd.activate.service - Service for snap application lxd.activate.
-- Boot 5bdb2170409343938cd4d04c79af2b16 --
Jul 01 22:03:50 skarletsky systemd[1]: Starting snap.lxd.activate.service -
Service for snap application lxd.activate...
Jul 01 22:03:50 skarletsky lxd.activate[1467378]: => Starting LXD activation
Jul 01 22:03:50 skarletsky lxd.activate[1467378]: ==> Loading snap configuration
Jul 01 22:03:50 skarletsky lxd.activate[1467378]: ==> Setting LXD socket
ownership
Jul 01 22:03:50 skarletsky lxd.activate[1467378]: ==> Setting LXD user socket
ownership
Jul 01 22:03:50 skarletsky lxd.activate[1467378]: ==> Checking if LXD needs to
be activated
Jul 01 22:03:51 skarletsky lxd.activate[1467422]: Error: Get
"http://unix.socket/": dial unix /var/snap/lxd/common/lxd/unix.socket: connect:
connection refused
Jul 01 22:03:51 skarletsky lxd.activate[1467378]: ====> Activation check
failed, forcing activation
Jul 01 22:03:51 skarletsky systemd[1]: snap.lxd.activate.service: Deactivated
successfully.
Jul 01 22:03:51 skarletsky systemd[1]: Finished snap.lxd.activate.service -
Service for snap application lxd.activate.
Jul 01 22:03:51 skarletsky systemd[1]: snap.lxd.activate.service: Consumed
1.061s CPU time.
Jul 01 22:08:02 skarletsky systemd[1]: Starting snap.lxd.activate.service -
Service for snap application lxd.activate...
Jul 01 22:08:02 skarletsky lxd.activate[1472685]: => Starting LXD activation
Jul 01 22:08:02 skarletsky lxd.activate[1472685]: ==> Loading snap configuration
Jul 01 22:08:02 skarletsky lxd.activate[1472685]: ==> Setting LXD user socket
ownership
Jul 01 22:08:02 skarletsky lxd.activate[1472685]: ==> Checking if LXD needs to
be activated
Jul 01 22:08:02 skarletsky lxd.activate[1472726]: Error: Get
"http://unix.socket/": dial unix /var/snap/lxd/common/lxd/unix.socket: connect:
no such file or directory
Jul 01 22:08:02 skarletsky lxd.activate[1472685]: ====> Activation check
failed, forcing activation
Jul 01 22:08:02 skarletsky systemd[1]: snap.lxd.activate.service: Deactivated
successfully.
Jul 01 22:08:02 skarletsky systemd[1]: Finished snap.lxd.activate.service -
Service for snap application lxd.activate.
$ sudo snap refresh lxd
2026-07-01T22:08:46Z INFO Waiting for "snap.lxd.daemon.service" to stop.
error: cannot perform the following tasks:
- Run configure hook of "lxd" snap if present (run hook "configure": cannot
perform operation: mount --make-slave /tmp/snap.rootfs_UyAXFd/etc/ld.so.cache:
Permission denied)
And I got it to work again by doing this
sudo systemctl stop snap.lxd.activate.service snap.lxd.daemon.service
sudo systemctl restart snapd
sleep 3
sudo systemctl start snap.lxd.activate.service
https://discourse.ubuntu.com/t/lxd-wont-start-due-to-mounting-
permission-issue/84729
However, now I'm running into similar issue with nvtop
$ nvtop
cannot preserve mount namespace of process 160595 as nvtop.mnt: Permission
denied
unexpected eof from helper process
I have a Garuda Linux system that's having similar issues with LXD, and I
didn't do that thing I did on my Ubuntu server to get it working as I don't
have anything important running on it, and nvtop is working fine
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: snapd 2.76+ubuntu24.04
ProcVersionSignature: Ubuntu 7.0.0-28.28~24.04.1-generic 7.0.12
Uname: Linux 7.0.0-28-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.28.2-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Tue Jul 21 07:57:12 2026
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
SnapChanges: no changes found
SourcePackage: snapd
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: snapd (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2161401
Title:
Can't run certain snaps due to namespace mounting issue
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