apt-cacher-ng: cron maintenance script exited with return code 134

[James Dingwall]

The cron.daily maintenance script always fails:

```
/etc/cron.daily/apt-cacher-ng:
Aborted
run-parts: /etc/cron.daily/apt-cacher-ng exited with return code 134
```

This has also been reported in Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1020909

The Debian report seems to suggest that 32-bit arch might be involved but my install is 64-bit on btrfs.

$ arch
x86_64

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.1 LTS
Release: 22.04
Codename: jammy

$ apt-cache policy apt-cacher-ng
apt-cacher-ng:
  Installed: 3.7.4-1build1
  Candidate: 3.7.4-1build1
  Version table:
 *** 3.7.4-1build1 500
        500 http://gb.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages
        100 /var/lib/dpkg/status