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... and disable it by default.

I doesn't seem enough to wait for udev to settle after partprobe. See
this trace:

  [...]
  + MTOOLS_SKIP_CHECK=1 mlabel -i "${SYSTEM_PARTITION}" -n ::Tails
  init :: could not read boot sector
  Cannot initialize '::'
  mlabel: Cannot initialize drive

Perhaps it would be enough to just call the `settle` function I just
added only before `mlabel`, but who knows where a similar issue will
appear next kernel upgrade? It's cheap to spam it, so why not?

Respectively: Lithuanian, Malay, Thai.

Since upgrading Linux 5.4 → 5.6 (or 5.5) or udev 241-7~deb10u3 →
241-7~deb10u4 we need this, else the system partition isn't available
for the dd operation below, which then fails.

Commit:e257c1fb renamed
wiki/src/doc/first_steps/startup_options.mdwn to
wiki/src/doc/first_steps/welcome_screen.mdwn

Installing this file to the right place was previously done via the t-p-s
Debian packaging, which we lost while importing that code base to tails.git.

Installing these files to the right place was previously done via the t-p-s
Debian packaging, which we lost while importing that code base to tails.git.

Move the Upgrader's trusted keyring to tails-upgrade-frontend's $HOME and make it writable by that user (refs: #15279)

This will be needed in order to refresh our signing key before checking
for upgrades.

This also updates the iuk.git snapshot (refs: #15281) with patches come from
iuk.git:feature/15281-single-squashfs-diff at
commit 38ee60cc71761a5b6024e81a52e1c36be051c1ec.

When Thunderbird is installed, it creates a symlink from
/usr/share/thunderbird/defaults/ to
/usr/lib/thunderbird/defaults. If we add the latter as a directory in
chroot_local-includes, this symlink is not created, and therefore
important preferences from /usr/share/thunderbird/defaults/pref/ are not set.