Installed , rebooted and stuck in logo

Yes it is, since you’re trying to read the log files on a live system which is not present. Open up Dolphin, mount up the partition by clicking on the partition you think you installed eos on, and arch-chroot into it, then issue the command again. It should work this time

Or maybe a bit easier way: when you mounted up, start clicking through the folders within that mount point: /var/log/endeavour-install.log it should open up with kwrite or kate - doesn’t matter, and from there you can copy paste here.