Norbert Preining hat fslint für debian neu gebaut.
:~$ LANG=C apt policy fslint
fslint:
Installed: (none)
Candidate: 2.46-2~np1
Version table:
2.46-2~np1 500
500 https://www.preining.info/debian unstable/main amd64 Packages
sudo echo -e "deb https://www.preining.info/debian unstable main \ndeb-src http://www.preining.info/debian unstable main" > /etc/apt/source.list.d/norb.list
Hmmm, I just installed it from there and it made no menu entry, wouldn't start from terminal, and didn't even show with "which fslint".
Also needs GPG key before it can be installed:
curl -fsSL https://www.preining.info/rsa.asc | apt-key add -
I liked FSlint for finding dupes and haven't found another GUI alternative that works as well. I was impressed at first that someone had ported it to Python3 when the original developer had no interest in doing so. Shame I wasn't successful with it. YMMV.
@hendrikL - do you have it installed?