Conflicts when updating:
File: NOTICE.txt Action: Validate Problem: Absent
File: Install-Linux-tar.txt Action: Validate Problem: Absent
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I just ran across this issue, and found a solution.
The self-update seems to be very picky about these files. Simply creating empty ones or even copying the ones from a wrong version doesn't work.
You need to download the exact package for your current (old) version, extract these two files and place them in the correct location.
In my case, using Manjaro Linux and upgrading from Android Studio 3.5.3 to the latest version (3.6.1), I downloaded:
https://dl.google.com/dl/android/studio/ide-zips/3.5.3.0/android-studio-ide-191.80264235-linux.tar.gz
Notice that you need the exact version (in my case 3.5.3.0) and build number (in my case 191.80264235). I found these in the PKGBUILD for my current Android Studio version.
Extracted the two files, and copied them to /opt/android-studio
Finally I ran Android Studio again (as root, to have the necessary write permissions for that directory), clicked to upgrade and it worked.
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