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Ubuntu 22.04

$ dpkg -S /usr/share/zoneinfo/Japan
tzdata: /usr/share/zoneinfo/Japan
$ dpkg -l tzdata | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-======================-============-=======================================
ii tzdata 2024a-0ubuntu0.22.04.1 all time zone and daylight-saving time data

Xubuntu 24.04

$ dpkg -l tzdata | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-================-============-=======================================
ii tzdata 2024a-3ubuntu1.1 all time zone and daylight-saving time data

Ubuntu 22.04

$ ls -l /usr/share/zoneinfo/Japan
lrwxrwxrwx 1 root root 10 May 3 2024 /usr/share/zoneinfo/Japan -> Asia/Tokyo

で

$ ls -l /usr/share/zoneinfo/Asia/Tokyo
-rw-r--r-- 1 root root 309 May 3 2024 /usr/share/zoneinfo/Asia/Tokyo

なんだけど、Xubuntu 24.04でJapanからAsia/Tokyoへのシンボリックリンクが取り除かれた理由を見つけることはできませんでした。そのうちまた探そう。

tzdata-2024a-3ubuntu1.1の/usr/share/doc/tzdata/changelog.Debian.gzにありました (2024a-0ubuntu0.22.34.1にはありませんでした):

> tzdata (2023c-8) unstable; urgency=medium
> :
> * Ship only timezones in tzdata that follow the current rules of geographical region (continent or ocean) and city name. Move all legacy timezone symlinks (that are upgraded during package update) to tzdata-legacy. This includes dropping the special handling for US/* timezones. (Closes: #1040997)

なるほどなあ

https://bugs-devel.debian.org/cgi-bin/bugreport.cgi?bug=1040997