Sorry didn't read your complete post at first.
What error message are you getting when you try to install updates to LR.
Please be specific in what the error message says.
This is probably due to a permissions problem. Your username doesn't have the correct permission for the Adobe app to install.
Cool, that's it! Running the installer as root did the trick:
Edit: Installed 6.10.0 in the same way and imported few Raws from X-T20.
Thanks a lot,