Created attachment 614528 [details]
save_y2logs output

The window I see:

Internal error. Please report a bug report with logs.
Details: Unknown device tmpfs
Caller:  /usr/share/YaST2/lib/bootloader/device_mapping.rb:65:in `to_mountby_d..

I'll attach yast logs and a screenshot.
This happened after choosing virtual machine and hypervisor (or similar) yast module and there installing: Xen tools and server and KVM tools and server.
After additional packages had been installed I got this error window.

I have a 13.2 with all updates and did not see this error before.

As tmpfs is mentioned, here my /etc/fstab which is rather small:
UUID=c1dd422d-3e9a-4c5b-a46b-f85e3596c4d2 /          ext4  acl,user_xattr 1 1
UUID=d477d510-e2a0-4b0e-b522-27eecff19448 swap       swap  defaults       0 0
UUID=984eec0a-5e8a-47fd-a626-c82b84d0c8fe /abuild    ext3  defaults       1 2
ett:/srv/nfs/ett                          /archteam  nfs   soft,vers=3    0 0
/dev/sdb1                                 /data      ext4  defaults       1 2