If I disable the sysrq behaviour in the kernel with:-
sysctl -w kernel.sysrq=0
I can then subsequently use ALT+PrtSc (although in GNOME it shows as ALT+SysRq rather than ALT+Print Screen as expected).
If I disable the sysrq behaviour in the kernel with:-
sysctl -w kernel.sysrq=0
I can then subsequently use ALT+PrtSc (although in GNOME it shows as ALT+SysRq rather than ALT+Print Screen as expected).