Comment 25 for bug 2055718

Verified on mantic, jammy, and focal:

```
$ schroot-wrapper -p tzdata -e -u root -c mantic
(mantic)root@desktop:~# dpkg -s tzdata | grep Version
Version: 2024a-0ubuntu0.23.10.1
(mantic)root@desktop:~# ln -sf /usr/share/zoneinfo/EST /etc/localtime
(mantic)root@desktop:~# dpkg-reconfigure --frontend noninteractive tzdata
(mantic)root@desktop:~# ls -alh /etc/localtime
lrwxrwxrwx 1 root root 23 Jun 5 05:43 /etc/localtime -> /usr/share/zoneinfo/EST
(mantic)root@desktop:~# ln -sf /usr/share/zoneinfo/US/East-Indiana /etc/localtime
(mantic)root@desktop:~# dpkg-reconfigure --frontend noninteractive tzdata

Current default time zone: 'America/Indiana/Indianapolis'
Local time is now: Wed Jun 5 06:43:41 EDT 2024.
Universal Time is now: Wed Jun 5 10:43:41 UTC 2024.

(mantic)root@desktop:~# ln -sf /usr/share/zoneinfo/America/Louisville /etc/localtime
(mantic)root@desktop:~# dpkg-reconfigure --frontend noninteractive tzdata

Current default time zone: 'America/Kentucky/Louisville'
Local time is now: Wed Jun 5 06:44:11 EDT 2024.
Universal Time is now: Wed Jun 5 10:44:11 UTC 2024.
```

```
$ schroot-wrapper -p tzdata -e -u root -c jammy
(jammy)root@desktop:~# dpkg -s tzdata | grep Version
Version: 2024a-0ubuntu0.22.04.1
(jammy)root@desktop:~# ln -sf /usr/share/zoneinfo/EST /etc/localtime
(jammy)root@desktop:~# dpkg-reconfigure --frontend noninteractive tzdata
(jammy)root@desktop:~# ls -alh /etc/localtime
lrwxrwxrwx 1 root root 23 Jun 5 05:45 /etc/localtime -> /usr/share/zoneinfo/EST
(jammy)root@desktop:~# ln -sf /usr/share/zoneinfo/US/East-Indiana /etc/localtime
(jammy)root@desktop:~# dpkg-reconfigure --frontend noninteractive tzdata

Current default time zone: 'America/Indiana/Indianapolis'
Local time is now: Wed Jun 5 06:45:23 EDT 2024.
Universal Time is now: Wed Jun 5 10:45:23 UTC 2024.

(jammy)root@desktop:~# ln -sf /usr/share/zoneinfo/America/Louisville /etc/localtime
(jammy)root@desktop:~# dpkg-reconfigure --frontend noninteractive tzdata

Current default time zone: 'America/Kentucky/Louisville'
Local time is now: Wed Jun 5 06:45:34 EDT 2024.
Universal Time is now: Wed Jun 5 10:45:34 UTC 2024.
```

```
$ schroot-wrapper -p tzdata -e -u root -c focal
(focal)root@desktop:~# dpkg -s tzdata | grep Version
Version: 2024a-0ubuntu0.20.04.1
(focal)root@desktop:~# ln -sf /usr/share/zoneinfo/EST /etc/localtime
(focal)root@desktop:~# dpkg-reconfigure --frontend noninteractive tzdata
(focal)root@desktop:~# ls -alh /etc/localtime
lrwxrwxrwx 1 root root 23 Jun 5 05:46 /etc/localtime -> /usr/share/zoneinfo/EST
(focal)root@desktop:~# ln -sf /usr/share/zoneinfo/US/East-Indiana /etc/localtime
(focal)root@desktop:~# dpkg-reconfigure --frontend noninteractive tzdata

Current default time zone: 'America/Indiana/Indianapolis'
Local time is now: Wed Jun 5 06:46:29 EDT 2024.
Universal Time is now: Wed Jun 5 10:46:29 UTC 2024.

(focal)root@desktop:~# ln -sf /usr/share/zoneinfo/America/Louisville /etc/localtime
(focal)root@desktop:~# dpkg-reconfigure --frontend noninteractive tzdata

Current default time zone: 'America/Kentucky/Louisville'
Local time is now: Wed Jun 5 06:46:40 EDT 2024.
Universal Time is now: Wed Jun 5 10:46:40 UTC 2024.
```