You are trying to install a package from upstream
(firejail_0.9.56-LTS_1_amd64.deb) over a firejail version from Ubuntu.
This makes problems, because they are slighlty differently packaged.
To install the package you downloaded, first remove firejail and
firejail-profiles cleanly from your system and then install the downloaded .deb.
But I would recommend to stay with the version provided by Ubuntu and maybe use
this PPA to get a newer firejail for your Ubuntu release:
https://launchpad.net/~deki/+archive/ubuntu/firejail
** Changed in: firejail (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1809766
Title:
package firejail 0.9.52-2 failed to install/upgrade: poging tot
overschrijven van '/etc/firejail/etr.profile', wat ook in pakket
firejail-profiles 0.9.52-2 zit
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