I just installed LEAP 15 and then went through all the updates (rebooting as required).
I now want to install the DHCP server. I went to software management and selected the 3 dhcp packages and then pressed accept. After about 2 seconds the software management window closes and I'm back at Yast. Nothing happened. Same behavior with any software package I select.
I didn't experience this in LEAP 14. I hope someone out there can help me.