Thanks, @cscs for your comment.
The last few hours I tried many things.
-
Installed the latest iso , this time I selected Plasma.
Installation went fine … until the bootloader had to be installed. It failed like all the other installations before. Syntax error -
I chrooted the new installed Manjaro Plasma straight from the live-usb.
Failed each time. Syntax error. -
I tried many suggested solutions from the forum. Renaming some files. Re-installing grub …
Nothing worked.
I gave up. Lost about 7 hours or more today and yesterday with this Syntax error, which results in failed installations of arch-based distros.
Installed - as already mentioned - several non-arch distros like Peppermint (Debian), Linux-Mint (Ubuntu), LMDE5 (Debian) … and they all installed without the error, just installed the bootloader like it should be.
By the way: I have an efi - PC.
Fedora didn´t work at all on this PC, I wasted many hours trying to install that monster, then gave up.
Of course there are people who install Fedora without problems. I bless them and hope that somewhere and somehow arch-based distros will come my way which install without that Syntax-error.