Enable Electrum's Ledger hardware wallet support

Closes #15353

See merge request tails/tails!272

Drop superfluous block.events_dfl_poll_msecs=1000 kernel parameter

See merge request tails/tails!274

Detect corrupt GnuPG public keyring and restore its backup

Closes #17807

See merge request tails/tails!275

We don't need to enable in-kernel media presence polling ourselves anymore:
systemd has been setting this to 2000 ms by default since v174 (2011!) and newer
.

refs #15353

Test suite: update expected title of the GitLab page we use

See merge request tails/tails!271

Update deb.torproject.org's APT key

Closes #18042

See merge request tails/tails!269

This reverts commit 29824dda.

The purpose of this package is to keep deb.torproject.org's APT key up-to-date,
which does not work in Tails as we discourage users from updating packages.

On the build/dev side, this package only adds complexity and confusion: we have
to install the APT key ourselves anyway (otherwise live-build would not be able
to install packages we install from deb.torproject.org, before this keyring
package is installed). So this only adds a second place where we need to
maintain the same information, with no benefit. For example, I updated the key
in bfcd3b23, but the deb.torproject.org-keyring
package from the APT snapshot we're using replaces it, in the built images, with
an older, expired one.

refs #18042

Require Buster or newer for running our test suite

Closes #17842

See merge request !254

Upgrade tor to 0.4.4.6

See merge request tails/tails!259

Test suite: use the qemu-xhci USB controller

Closes #15831

See merge request tails/tails!255

Stop installing the Unifont fonts

See merge request tails/tails!263

Update Thunderbird patch series to apply on top of 78.5.0

Closes #18034

See merge request tails/tails!264

Release process: drop dependency on parallel_collect_IUKs

See merge request tails/tails!267

Debug info is only useful when working on that script or to debug failures.
Let's use a terser output in the default case.

The only reason why we needed parallel_collect_IUKs so far was so that
bin/copy-iuks-to-rsync-server-and-verify, which is run by the RM during the
release process, can fetch every IUK built by Jenkins from a single place.

But parallel_collect_IUKs is painfully slow (tails/sysadmin#17744).

So let's instead teach bin/copy-iuks-to-rsync-server-and-verify how to locate
the IUKs it needs under
https://nightly.tails.boum.org/build_IUKs/configurations/ and download them from
there on rsync.lizard.

Allow users to change persisted admin password option

Closes #18018

See merge request tails/tails!266

segfault authored Nov 21, 2020 and intrigeri committed Nov 23, 2020

refs: #18018

This reverts commit e0112fc0.

In #15807 we stopped pretending to support every possible language.
Since ed7a35df we install Noto fonts
that cover the scripts for every language we currently support,
and render much better than Unifont.

https://bugzilla.mozilla.org/show_bug.cgi?id=1654950
https://hg.mozilla.org/releases/comm-esr78/rev/0760c5edac573b68e94030f2a8f80394c50e9f17

https://bugzilla.mozilla.org/show_bug.cgi?id=1675285
https://hg.mozilla.org/releases/comm-esr78/rev/d2373639e30fcf38ec44ffa01dc46b6859f2d566

This saves a little bit of time when one patch fails to apply.

No commit message

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wiki/src/install/inc/steps/download.inline.ar.po: updating as wiki/src/install/inc/steps/download.inline.de.po has changed.
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Follow-up on edbc621f.