[Bug 2141364] Re: Unable to use sbuild+unshare or the Element snap with linux 6.19

I still haven't rebooted my primary box, but I have booted another box
and ~confirmed the same issues there when i boot with 6.19, but NOT when
I select the older 6.18 kernel.

Whilst that box didn't have element-desktop setup; it did have the Opera
web-browser installed with it opening & restoring the last session...

When booted with a 6.19 kernel, I was getting
>The web page at https://askubuntu.com/questions might be temporarily down or it may have moved permanently to a new web address.
> ERR_ACCESS_DENIED
errors, yet boot with 6.18 kernel and the page shows as expected.

If a list of apps where I've encountered issues is helpful, I can
provide more; but element-desktop & opera are just two & messages appear
~identical when those apps are started at terminal thus I believe it's
the same issue.

guiverc@d7050-next:/de2900/lubuntu_64$ snap info opera
name: opera
summary: Fast, secure, easy-to-use browser
publisher: Opera (opera-software✓)
store-url: https://snapcraft.io/opera
license: unset
description: |
Try the Opera browser - now with a built-in ad blocker, battery saver and free VPN.
commands:
- opera
snap-id: AljMvoQbHtnnrka00lIoxHJ6Qhfn0X8m
tracking: latest/stable
refresh-date: 6 days ago, at 10:22 AEDT
channels:
latest/stable: 127.0.5778.45 2026-02-10 (428) 186MB -

my primary box is
- dell [optiplex] 7050 (i5-6500, 16gb, intel hd530/i915, amd cedar radeon)
secondary box with a resolute install is
- dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)
but messages are essentially equal on each.

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https://bugs.launchpad.net/bugs/2141364

Title:
Unable to use sbuild+unshare or the Element snap with linux 6.19

Status in apparmor package in Ubuntu:
Confirmed
Status in linux package in Ubuntu:
Confirmed

Bug description:
After booting into linux 6.19 today, I was unable to:
1. Connect to the Matrix server using the Element snap
2. Use sbuild with the recommended unshare backend. It wasn't able to reach the network to download packages with apt.

Both of these are highly disruptive to Ubuntu Developers using Ubuntu
26.04 LTS.

These issues go away when I boot into linux 6.18. These issues happen
every time.

I'm attaching my systemd journal which shows the apparmor denials.

ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-6.19.0-3-generic 6.19.0-3.3+1
ProcVersionSignature: Ubuntu 6.19.0-3.3-generic 6.19.0-rc6
Uname: Linux 6.19.0-3-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: jeremy 6913 F.... wireplumber
 /dev/snd/controlC0: jeremy 6913 F.... wireplumber
 /dev/snd/seq: jeremy 6896 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Feb 9 19:29:30 2026
InstallationDate: Installed on 2025-04-14 (301 days ago)
InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215)
IwDevWlp1s0Link: Not connected.
MachineType: Framework Laptop 13 (AMD Ryzen 7040Series)
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.19.0-3-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M vt.handoff=7
RelatedPackageVersions:
 firmware-sof N/A
 linux-firmware 20260108.gitd86b47f7-0ubuntu1
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2025-12-18 (54 days ago)
dmi.bios.date: 01/08/2026
dmi.bios.release: 3.18
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 03.18
dmi.board.asset.tag: *
dmi.board.name: FRANMDCP07
dmi.board.vendor: Framework
dmi.board.version: A7
dmi.chassis.asset.tag: FRANDRCPA75075003V
dmi.chassis.type: 10
dmi.chassis.vendor: Framework
dmi.chassis.version: A7
dmi.modalias: dmi:bvnINSYDECorp.:bvr03.18:bd01/08/2026:br3.18:svnFramework:pnLaptop13(AMDRyzen7040Series):pvrA7:rvnFramework:rnFRANMDCP07:rvrA7:cvnFramework:ct10:cvrA7:skuFRANDRCP07:
dmi.product.family: Laptop
dmi.product.name: Laptop 13 (AMD Ryzen 7040Series)
dmi.product.sku: FRANDRCP07
dmi.product.version: A7
dmi.sys.vendor: Framework

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