I just registered to make a reply so that I can help those who have the same problem like me which cost me 4 hours of trial and error.
This is what you will do. (My client have CENTOS8 but it will work for you as well)
First, you need to upgrade. WHAT/.? We even haven’t successfully installed because of the error “ERROR: Double requirement given: cffi==1.14.1” always at the end!!!
Relax. There’s a prob with their installation list.
This is the very first thing you do. Type this command in the shell.
sh <(curl https://raw.githubusercontent.com/usmannasir/cyberpanel/stable/preUpgrade.sh || wget -O - https://raw.githubusercontent.com/usmannasir/cyberpanel/stable/preUpgrade.sh)
If it ask for a branch version just press enter then the process begin… BUT in the end you will get an error!!! and it quits.
CONGRATS!!!
This is your moment!!! This is your time!!! It’s showtime!
Now, type this command in the shell:
sh <(curl https://cyberpanel.net/install.sh || wget -O - https://cyberpanel.net/install.sh)
and wait for it to successfully finished!
GOOD JOB!