Comment 19 for bug 1601971

That's cute it is still there after this LTS lifetime. ver. 16.04.7, booted from USB flash:

root@ubuntu:~# apt update
Ign:1 cdrom://Ubuntu 16.04.7 LTS _Xenial Xerus_ - Release amd64 (20200806) xenial InRelease
Hit:2 cdrom://Ubuntu 16.04.7 LTS _Xenial Xerus_ - Release amd64 (20200806) xenial Release
Hit:4 http://archive.ubuntu.com/ubuntu xenial InRelease
Get:5 http://archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]
Get:6 http://security.ubuntu.com/ubuntu xenial-security InRelease [109 kB]
Get:7 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages [2,049 kB]
Get:8 http://archive.ubuntu.com/ubuntu xenial-updates/main Translation-en [482 kB]
Get:9 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 DEP-11 Metadata [327 kB]
Get:10 http://archive.ubuntu.com/ubuntu xenial-updates/main DEP-11 64x64 Icons [252 kB]
Get:11 http://archive.ubuntu.com/ubuntu xenial-updates/restricted amd64 Packages [10.2 kB]
Get:12 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages [1,648 kB]
Get:13 http://security.ubuntu.com/ubuntu xenial-security/main Translation-en [380 kB]
Get:14 http://security.ubuntu.com/ubuntu xenial-security/main amd64 DEP-11 Metadata [93.7 kB]
Get:15 http://security.ubuntu.com/ubuntu xenial-security/main DEP-11 64x64 Icons [111 kB]
Get:16 http://security.ubuntu.com/ubuntu xenial-security/restricted amd64 Packages [9,824 B]
Fetched 5,581 kB in 1s (3,114 kB/s)

** (appstreamcli:3359): CRITICAL **: Error while moving old database out of the way.
AppStream cache update failed.
Reading package lists... Done
Building dependency tree
Reading state information... Done
200 packages can be upgraded. Run 'apt list --upgradable' to see them.

and yes, #11 still fixes it. Thanks.