I guess you mean "New Root Midnight Commander" from the Konsole session menu.
This is then a konsole bug, and I can confirm it in Ubuntu Hardy.
When starting the session, you get asked for the password, but then it
exits, probably with "su: Authentication failure"
** Changed in: kdebase (Ubuntu)
Sourcepackagename: mc => kdebase
Assignee: (unassigned) => dAniel hAhler (blueyed)
Status: New => In Progress
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Root midnight commander crashes on startup
https://bugs.launchpad.net/bugs/93063
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