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Various problem when upgrading from 20.04 to 22.04

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I encountered several problems when upgrading from 20.04 to 22.04

First, I upgraded 20.04. Something went wrong as I needed to boot then NetworkManager was not started. When trying to start it, I got following message

NetworkManager: /usr/local/lib/libssh.so.4: version `LIBSSH_4_8_1' not found (required by /usr/lib/x86_64-linux-gnu/libcurl-gnutls.so.4)

After a while, I found that libssh.so.4.8 was no more in /usr/local/lib/ but in /usr/lib/x86_64-linux-gnu/

A symlink from /usr/local/lib/libssh.so.4 to /usr/lib/x86_64-linux-gnu/libssh.so.4.8.7 solved this problem.

I also lost all my personal profile in Firefox : bookmarks, extension, etc. How to recover it ?

Now I try to upgrade to 22.04 Each time I try, I got the same message :

# do-release-upgrade 
Checking for a new Ubuntu release
Please install all available updates for your release before upgrading.

while I did (several times): apt update; apt upgrade/full-upgrade/dist-upgrade

update-manager also claims that my distro is up to date, and proposes to upgrade to 22.04, then I got the same message than from do-release-upgrade

Any hints ?

Thanks a lot

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