Downgrade fails with error message: "Error: Can't un-tar GUI"

Workaround: Reboot the NetScaler ADC and run the installns script again for the same build.

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Problem Cause

This is known issue for upgrading to or downgrading from NetScaler 10.5 
If you upgrade from any of the following builds to NetScaler release 10.5, or downgrade from NetScaler release 10.5, to any of the following builds, the error message "Cannot untar GUI" appears: 
* Release 10.1, build 122.17 or earlier 
* Release 10.0, build 78.6 or earlier 
* Release 9.3, build 65.8 or earlier