mkdir '/cache/recovery': Required key not available

[Reynald]

Ubports installer error on OnePlus 6 :

info: Welcome to the UBports Installer version 0.9.1-beta!
[13152:1013/160212.256937:ERROR:sandbox_linux.cc(374)] InitializeSandbox() called with multiple threads in process gpu-process.
info: device detected: enchilada
info: Installing Ubuntu Touch on your OnePlus 6/6T (enchilada)
info: configuring...
info: settings: {"bootstrap":true,"wipe":"","channel":"16.04/arm64/android9/stable"}
info: Downloading 9 files
info: Downloaded file 1 of 9
info: Downloaded file 2 of 9
info: Downloaded file 3 of 9
info: Downloaded file 4 of 9
info: Downloaded file 5 of 9
info: Downloaded file 6 of 9
info: Downloaded file 7 of 9
info: Downloaded file 8 of 9
info: Downloaded file 9 of 9
error: Error: adb:preparesystemimage: Error: {"error":{"code":1,"cmd":"adb -P 5037 shell mkdir -p /cache/recovery"},"stderr":"mkdir: '/cache/recovery': Required key not available"}
stack trace: Error: {"error":{"code":1,"cmd":"adb -P 5037 shell mkdir -p /cache/recovery"},"stderr":"mkdir: '/cache/recovery': Required key not available"}
    at /opt/ubports-installer/resources/app.asar.unpacked/node_modules/promise-android-tools/lib/module.cjs:117:20
    at ChildProcess.exithandler (node:child_process:413:5)
    at ChildProcess.emit (node:events:394:28)
    at maybeClose (node:internal/child_process:1067:16)
    at Socket.<anonymous> (node:internal/child_process:453:11)
    at Socket.emit (node:events:394:28)
    at Pipe.<anonymous> (node:net:672:12)

[Reynald]

@reynald Same problem after wiping user data from recovery mode.

[Alter]

@reynald : Installer version 0.9.1 has issues. Just try an older version. Will put link here wait a sec
EDIT: here > https://github.com/ubports/ubports-installer/releases (scroll down on that page for older versions and all their package types, I've just read that 0.8.8 and 0.8.9 work best apparently)

[Reynald]

@alter Maybe, but... I tried installer 0.9.1 because installer 0.8.9 has downloading issues...

[Alter]

@reynald : I have a Volla Phone and in my case I also saw a download error. The installer could not get the .zip from Volla website. I used a browser for that. The installer had created .cache/ubports on my Ubuntu desktop PC. In the contents in a subfolder of that was a .zip which was 0 bytes. Replaced it with the full zip. Then opened installer and could install from there. Maybe works for you.

[Reynald]

@alter Well... I start thinking a manual install script based on curl, fastboot and adb would be more usable than circumventing so many ubports-installer bugs!

[Alter]

@reynald : I don't know any scripting, so for me the installer is still helpful. My first install of Ubuntu Touch on Nexus 5 went smooth as silk. The install on Volla Phone was different, but succeeded in the end, without needing scripting knowledge. I only downloaded that .zip manually and placed it in the right folder. I can understand your frustration at this point, but don't give up and try again! Good luck!

[Luksus]

@Reynald please try wiping data and cache with twrp recovery first...

[Reynald]

Reinstalling older 0.8.9 installer fixed the flashing bug.
UTouch finally installed on my OnePlus!!! (one month battle...)

[Alter]

@reynald : Congratulations! Hope you will be as pleased with the system as I am