I have the same printer as @ewige (CLX-6260ND), and the same problem as all of you guys. The fix that ewige proposed is not working for me. What appears to have worked, however, is a factory reset of the printer. As per some other web page:
Press "Menu > # > 1 > 9 > 3 > 4 " on the printer panel.
Press Menu.
Select "Tech Mode".
Select Data Setup.
Select Clear All Mem.
After this I got at least one color printout, from CentOS 8 using the latest (but now somewhat dated) Samsung drivers and firmware.
Press "Menu > # > 1 > 9 > 3 > 4 " on the printer panel.
Press Menu.
Select "Tech Mode".
Select Data Setup.
Select Clear All Mem.
After this I got at least one color printout, from CentOS 8 using the latest (but now somewhat dated) Samsung drivers and firmware.