I'm happy to report that apt version 2.0.0 fixed this bug, thanks!
$ apt-cache policy apt
apt:
Installed: 2.0.0
Candidate: 2.0.0
Version table:
*** 2.0.0 500
500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
** Changed in: apt (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1867488
Title:
APT::Sandbox::Seccomp prevents connect,sendto,socket syscalls on Focal
Status in apt package in Ubuntu:
Fix Released
Bug description:
# Steps to reproduce:
$ lxc launch images:ubuntu/focal fa1
$ lxc shell fa1
root@fa1:~# echo 'APT::Sandbox::Seccomp "true";' >
/etc/apt/apt.conf.d/01apt-seccomp
root@fa1:~# rm /var/lib/apt/lists/*Release # makes sure we fetch stuff from
the network
root@fa1:~# apt-get update
Hit:1 http://security.ubuntu.com/ubuntu focal-security InRelease
Get:2 http://archive.ubuntu.com/ubuntu focal InRelease [255 kB]
Hit:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Get:4 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages [976 kB]
Get:5 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages [8,623
kB]
30% [4 Packages store 0 B] [5 Packages 100 kB/8,623 kB 1%]
**** Seccomp prevented execution of syscall 0000000041 on architecture amd64
****
Reading package lists... Done
E: Method store has died unexpectedly!
E: Sub-process store returned an error code (31)
This was tested in a container as well as inside a VM, same issue.
This used to work with Bionic.
# Workaround
Fortunately, apt supports manual whitelisting of syscalls. A
workaround is to allow 3 more syscalls.
root@fa1:~# echo 'APT::Sandbox::Seccomp::Allow
"connect,sendto,socket";' >> /etc/apt/apt.conf.d/01apt-seccomp
# Additional information
root@fa1:~# lsb_release -rd
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04
root@fa1:~# uname -a
Linux fa1 5.3.0-40-generic #32~18.04.1-Ubuntu SMP Mon Feb 3 14:05:59 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
root@fa1:~# apt-cache policy apt libc-bin
apt:
Installed: 1.9.10
Candidate: 1.9.10
Version table:
*** 1.9.10 500
500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
libc-bin:
Installed: 2.31-0ubuntu5
Candidate: 2.31-0ubuntu5
Version table:
*** 2.31-0ubuntu5 500
500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
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