Hey @Glemon ,
Please have a look at this if you want to use dual boot.
If not, I have some steps:
- While using a a live USB boot into manjaro with Open Source Software.
- DO not Start Clarames
- Open KDE Partition Manager, Password: manjaro
- Now KDE Partition Manager will work fine and Format the SSD or HDD with ext4 you want to install Manjaro on
- After success, reboot and then Again go into live USB with Open Source or Propitiatory Drivers, and it will work fine.