我正在尝试安装tcolorbox包但得到这个，我正在使用流行操作系统
$tlmgr install tcolorbox
(running on Debian, switching to user mode!)
(see /usr/share/doc/texlive-base/README.tlmgr-on-Debian.md)
tlmgr: Local TeX Live (2020) is older than remote repository (2021).
Cross release updates are only supported with
update-tlmgr-latest(.sh/.exe) --update
See https://tug.org/texlive/upgrade.html for details.
我已按照update-tlmgr-latest步骤操作并尝试更新，但显示
/usr/share/texlive$ sh update-tlmgr-latest.sh -- --upgrade
Verifying archive integrity... All good.
Uncompressing TeX Live Manager Updater 100%
./runme.sh: Cannot find TeX Live root using kpsewhich --var-value=SELFAUTOPARENT.
./runme.sh: (no tlpkg/texlive.tlpdb and/or tlpkg/tlpobj/.)
./runme.sh: Please set your PATH as needed, otherwise it's hopeless.