The Avast error code 0x8009000bu occurs during the boot-time scan, or it may occur due to some authentication problem on the program. When the Avast password and Avast antivirus don’t sync with one another, the avast 0x8009000bu error occurs. The error code can also pop up when the Google account you use for logging into the Avast program doesn’t enable the applications. The error message may also occur due to functionality issues while using the Avast program. Below are the problems with their solutions that lead to error code.
Now, see if the Avast error code 0x8009000bu has been fixed.