Comment 5 for bug 1872564

Squid is failing to start due to this apparmor deny:
[ 7271.822230] audit: type=1400 audit(1588602033.905:516): apparmor="DENIED" operation="open" namespace="root//lxd-autopkgtest-lxd-sljvrl_<var-snap-lxd-common-lxd>" profile="/usr/sbin/squid" name="/proc/sys/kernel/random/boot_id" pid=289530 comm="squid" requested_mask="r" denied_mask="r" fsuid=1000000 ouid=1000000

which results in:
2020/05/04 14:20:34 kid1| WARNING: failed to send start-up notification to systemd
    sd_notify() error: (13) Permission denied

and
# time systemctl start squid
Job for squid.service failed because a timeout was exceeded.
See "systemctl status squid.service" and "journalctl -xe" for details.

real 2m6.317s
user 0m0.014s
sys 0m0.011s