[unix] Explain ssh -Y if DISPLAY cannot be set.
[unix] Explain ssh -Y if DISPLAY cannot be set.

root-mirror/root,olifre/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,olifre/root,root-mirror/root,karies/root,karies/root,olifre/root,karies/root,karies/root,karies/root,olifre/root,karies/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,karies/root