我刚刚使用TWRP安装了LineaGeoS 14.1。然后，按照本指南我下载了 addonsu-arm-signed.zip 到了我的SD卡并安装它，也使用TWRP。
I just installed LineageOS 14.1 using TWRP.
Then, following this guide I downloaded addonsu-arm-signed.zip to my SD card and installed it, also using TWRP.
PROBLEM: Then I installed Titanium Backup from Play Store, an got this message:
Is there a mistake in my procedure?
Is there a missing step?
Apps and ADB.
Now you have root and Titanium Backup finds it:
I just found I had to switch from ADB only to Apps and ADB. Not sure why, since the issue was with ADB itself.