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The last LineageOS OTA caused a TWRP boot loop.
I can get to fastboot with the volume keys.
I can use ./adb shell briefly before reboot.
./fastboot erase cache
./fastboot flash recovery twrp-3.1.1-0-Z00T.img
did not resolve the issue. What can be done to get this device booted?
On Ubuntu 18.04
sudo apt install android-sdk-platform-tools-common fastboot
fastboot continue
Got me back to LineageOS.
It also seems to have fixed TWRP.