Comment 19 for bug 1892825

Verified:

root@focal-vm:~# dpkg -l locales | grep ^ii
ii locales 2.31-0ubuntu9.7 all GNU C Library: National Language (locale) data [support]
root@focal-vm:~# cp /etc/default/locale /tmp/locale
root@focal-vm:~# update-locale --locale-file /tmp/locale LANGUAGE = en_US.UTF-8
root@focal-vm:~# diff -u /etc/default/locale /tmp/locale
--- /etc/default/locale 2022-04-19 18:07:15.583098433 +0000
+++ /tmp/locale 2022-04-26 00:56:47.140767044 +0000
@@ -1 +1,2 @@
 LANG=en_US.UTF-8
+=
root@focal-vm:~# apt install -y -t focal-proposed libc6 locales libc-bin
[snip]

root@focal-vm:~# dpkg -l locales | grep ^ii
ii locales 2.31-0ubuntu9.9 all GNU C Library: National Language (locale) data [support]
root@focal-vm:~# cp /etc/default/locale /tmp/locale
root@focal-vm:~# update-locale --locale-file /tmp/locale LANGUAGE = en_US.UTF-8
root@focal-vm:~# diff -u /etc/default/locale /tmp/locale
root@focal-vm:~# update-locale --locale-file /tmp/locale LANGUAGE=en_US.UTF-8
root@focal-vm:~# diff -u /etc/default/locale /tmp/locale
--- /etc/default/locale 2022-04-26 00:58:34.429027581 +0000
+++ /tmp/locale 2022-04-26 00:58:39.333040731 +0000
@@ -1 +1,2 @@
 LANG=en_US.UTF-8
+LANGUAGE=en_US.UTF-8
root@focal-vm:~# update-locale --locale-file /tmp/locale LANGUAGE=en_GB.UTF-8
root@focal-vm:~# diff -u /etc/default/locale /tmp/locale
--- /etc/default/locale 2022-04-26 00:58:34.429027581 +0000
+++ /tmp/locale 2022-04-26 00:58:58.457092930 +0000
@@ -1 +1,2 @@
 LANG=en_US.UTF-8
+LANGUAGE=en_GB.UTF-8
root@focal-vm:~# update-locale --locale-file /tmp/locale LANGUAGE
root@focal-vm:~# diff -u /etc/default/locale /tmp/locale
--- /etc/default/locale 2022-04-26 00:58:34.429027581 +0000
+++ /tmp/locale 2022-04-26 00:59:11.493129343 +0000
@@ -1 +1,2 @@
 LANG=en_US.UTF-8
+#LANGUAGE=en_GB.UTF-8