% sudo tlmgr update --self --all
query_ctan_mirror: Programs not set up, trying wget
cannot contact mirror.ctan.org, returning a backbone server!
tlmgr: package repository http://www.ctan.org/tex-archive/systems/texlive/tlnet (not verified: gpg unavailable)
tlmgr: saving backups to /usr/local/texlive/2020/tlpkg/backups
TLPDB::_install_package: unsupported container format xz
tlmgr: Installation of new version of texlive.infra failed, trying to unwind.
[1/2, ??:??/??:??] update: texlive.infra [424k] (54630 -> 57705) ... tlmgr: Restoring old package state succeeded.
done
TLPDB::_install_package: unsupported container format xz
tlmgr: Installation of new version of texlive.infra.x86_64-darwin failed, trying to unwind.
[2/2, 00:00/00:00] update: texlive.infra.x86_64-darwin [629k] (53254 -> 57584) ... tlmgr: Restoring old package state succeeded.
done
tlmgr: action update returned an error; continuing.
tlmgr: package log updated: /usr/local/texlive/2020/texmf-var/web2c/tlmgr.log
tlmgr: An error has occurred. See above messages. Exiting.
となりました。なにがだめなのでしょうか?
よろしくお願いします。