Hi,
I installed 16.04/dev to OP3T today (after having OxyxenOS and LineageOS for a little time, coming back to UBports).
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After LineageOS, I installed OxygenOS back, with all checked first install and format. That did not have errors.
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I clicked at Settings/info/OxygenOS some version number multiple times to enable developer mode.
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From developer mode enabled USB debugging. Then rebooted to fastboot with volume up and power.
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Unlocked:
sudo apt -y install adb
sudo su
fastboot devices
fastboot oem unlock
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I used UBports Installer 0.10.0 AppImage (as normal user, chmod +x ubports...appimage , ./ubports...appimage) to start install of Ubuntu Touch 16.04/dev, with checkboxes enabled to first install and format.
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At TWRP, when Advanced Format complained about volumes mounted, I rebooted back to recovery mode so had those formats done again successfully.
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I had the timeout while installing Ubuntu Touch issue, so I used TWRP terminal to look at /etc/fstab and format to ext2 those data+system+cache like this, with that device name and number:
cat /etc/fstab
ls /dev/block/
umount /dev/block/<device>
mkfs.ext2 /dev/block/<device>
reboot
Timeout issue info is from https://forums.ubports.com/post/54813
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I used UBports Installer to install 16.04/dev without checking first install and format options.
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Install success. Rebooted 2 times (first reboot did bring some error, 2nd boot booted to Ubuntu Touch, so reboot enough times).