Comment 3 for bug 1362963

I can confirm that findsmb is also missing from the package smbclient 2:4.1.13+dfsg-4ubuntu3 in Kubuntu 15.04 (Kubuntu Vivid).
After installing that package and reinstalling it (also reinstalling samba) the findsmb script does not exist anywhere.

For a workaround, I have taken a copy of the findsmb script from an older installation (Mint 14 "Nadia"/Ubuntu Quantal) and that copy runs and seems to do what it is supposed to do - or at the very least it is listing the systems that I was expecting to respond to it).