The ClearOS 7.7.1.272661 ISO is a beta ISO. You should have received this warning when you performed the install. If you are trying to install a non-beta version of ClearOS, please use the 7.6 ISO and then perform the upgrade.

As for the viability, 'I can not install the operating system', it sounds like the OS installed just fine. In fact, you can always just use the webconfig to manage the install. If you don't know the current IP, you can hit CTRL+ALT+F3 and the log in and see the ip address by running 'ip a'.

Again, this ISO is a test ISO and there could be other problems. I appreciate the feedback.

If you need the current production 7.x ISO instead of the testing ISO, you can ALWAYS download it here:

http://mirror.clearos.com/clearos/7/iso/x86_64/ClearOS-DVD-x86_64.iso