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For some stupid reason I excecuted sudo chmod -R 755 /. Now none of my software will run. Can I fix this without reinstalling? And if yes, how?

  • bash should have prevented you from operating on /... but often computers will do this sort of thing if they detect that you don't have a backup of your data. – Richard Sep 1 '13 at 18:47
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there's no real undo to chmod. If yours is a reasonably new install we could give you a list of all main files/directories and you could try to restore permissions one by one, but sincerely that would be a hell of a job.

You could better boot from live CD, backup all your stuff and re-install.

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