tlmgr : Error with Texlive

I use Xubuntu 20.04, Texstudio with Texlive.
I want to load and install new package with tlmgr in graphical user mode. When i push the button "load deposit by default", the window cut off and i can read in a terminal window :

/usr/bin/tlmgr: unexpected return value from verify_checksum: -5

Same answer with the command tlmgr udate -all

How to fix it ?
Thanks for your help.