Comment 4 for bug 1960583

I guess i have found the root cause of this issue.
When running the upgrade from 20.04 LTS to 22.04 LTS with terminal with this command :

```
sudo do-release-upgrade -d
```

it has an option for users to choose from whether to keep the old configuration file of

```
Configuration file '/etc/sysctl.conf'
==> Modified (by you or a script) since installation
==> Package distribution has shipped an updated version.
 What would you like to do about it ? Your options are :
  Y or I : Install the package maintainer's version
  N or O : keep your currently-installed version
    D : show the different between the versions
    Z : start a shell to examine the situation
The default action is to keep your current version.
*** sysctl.conf (Y/I/N/O/D/Z) [default=N] ?
```
(screenshot attached in this post)

If you choose N, the system will get the error (described in this ticket) with the update and upgrade process in the 22.04 LTS version.

Hope someone can do the actual test with this to verify.
Thanks