Ubuntu 19.04 all softwere lost its permisssion?

by S. Shahrior   Last Updated October 09, 2019 14:02 PM

I was accidentally move ''/usr'' directory to ''/home/sagor/Download'' that time my pc screen become black . And later with live session I manage to put the ''/usr'' directory to its original position. Then my pc was ok boot up and I got everthing back like before. But when I try to run a softewre its give error.

After some research I found that all softwere lost its permisssion.

Is there any way to put the orginal permission back ????

NT: Can't reinstall, I have dual boot ubuntu with windows 10

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