After a fresh install of manjaro kde 18.0.4 stable,i found upon reboot the error:
invalid partition table!
i also want to mention that when you get the above error and press enter it loads into the system as normal without problems
i would say this could be an issue with the installation application during the install process.
when partitioning the drives with erase all, i see that it has the option of bootloader to install and where to install it. however, when it goes to work to make those chosen settings, it fails to set the boot flag on sda1, hence the error invalid partition table