Steam doesn’t open at all and I deleted download cache from the app itself. Also I’m no longer using steam.
Dropping in to add a little more info - I think my situation is identical to this thread, but apologies if I’m off-base.
OS: Fedora Linux 44 (Workstation Edition)
I had the same symptoms: successful curl/ping against client-update.steamstatic.com, but on steam startup would get a Download failed: http error 0 (client-update.steamstatic.com/steam_client_ubuntu12)
Setting up a symlink for /etc/ssl/certs/ca-certificates.crt was what finally resolved the issue.
sudo ln -s /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem /etc/ssl/certs/ca-certificates.crt
This change looks highly relevant: Changes/droppingOfCertPemFile - Fedora Project Wiki
Thanks so much for your debugging here @bryanmoore, it was very helpful!!
Thanks. But I move between two places a lot so I can’t really play games on my pc. But I’ll try your solution if I ever redownload steam and face the problem again 
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Thanks for dropping by. The info you shared was really helpful especially upgrade compatibility impact looks like the root cause of the error we were facing. Thanks everyone 
Ultimately, in Fedora 44, I fixed it with:
sudo ln -s /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem /etc/pki/tls/certs/ca-certificates.crt
btw if there is an issue with failing to create symbolic link you can fix that by replacing -s with -sf
i love you
Thanks everyone especially Barry A Scott for your effort, thanks to sean, Raul Perdomo and Samuel Johnson as well. Recently during the update from f43 to 44 power went out and my system broke so I had to do a clean install. After that I installed steam normally and it now works as expected. Wish you all a happy life.