Significant delay while updating

[Deny]

Theres a significant delay after apt completes the step "Fetched 23.1 MB in 13s (1841 kB/s)" and before it starts to "Reading package lists... Done".

It looks like it's frozen.

It's something I've only noticed in Ubuntu 20.04.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: apt 2.3.9
ProcVersionSignature: Ubuntu 5.13.0-1008.9-raspi 5.13.14
Uname: Linux 5.13.0-1008-raspi armv7l
ApportVersion: 2.20.11-0ubuntu69
Architecture: armhf
CasperMD5CheckResult: unknown
Date: Wed Oct 6 08:01:43 2021
ImageMediaBuild: 20210819.1
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)