Public bug reported:
In 26.04 LTS when launching firefox installed from a deb, I get the
following errors in the terminal:
[1398986] Sandbox: CanCreateUserNamespace() unshare(CLONE_NEWPID):
EPERM
It seems to arise because the default firefox profile includes with the
apparmor package there is a bug in the executable match:
/{usr/lib/firefox{,-esr,-beta,-devedition,-nightly},opt/firefox}/firefox{,-esr,-bin}
flags=(unconfined) {
As per https://askubuntu.com/a/1566883/286552 this may be due to the
nested brackets. I've confirmed it can be addressed by simplifying (and
dropping the opt piece) the line to:
/usr/lib/firefox{,-esr,-beta,-devedition,-nightly}/firefox{,-esr,-bin}
flags=(unconfined) {
If indeed the issue is the nested brackets, I think the fix might be to
make it something like
/{usr/lib,opt}/firefox{,-esr,-beta,-devedition,-nightly}/firefox{,-esr,-bin}
flags=(unconfined) {
** Affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2166706
Title:
Default firefox profile broken in 26.04 LTS, userns disabled
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