I gather that there were good security-related reasons for discontinuing gksudo. But it's quite inconvenient not having it, for example when you are adding new items to the Linux Mint main menu (using menulibre, for example).
Here's what I do:
- install ssh-askpass
- add this line
SUDO_ASKPASS=/usr/bin/ssh-askpassto the file
- Then, in menu or batch commands that you want to pop-up a graphical p/w prompt, say
sudo -A <command>