I struggled a bit (see my other post here) and rooted the tablet, but now it functions. It was well worth it. What a pleasure to go to the app store and everything is free! My kid got all the games and she loves the planetarium.

SOLVED!

Typing in that order 3 lines of code :
adb devices
adb reboot bootloader
fastboot flashing unlock

Finally did the trick!

UBP took over and installed Ubuntu Touch!

Here and there, I see "This post has been deleted". Why? So we can see the moderators are doing their job? We can see that by reading the forum... I think leaving these skeletons makes the forums look a bit untidy. Just my own opinion

I struggled a bit (see my other post here) and rooted the tablet, but now it functions. It was well worth it. What a pleasure to go to the app store and everything is free! My kid got all the games and she loves the planetarium.

SOLVED!

Typing in that order 3 lines of code :
adb devices
adb reboot bootloader
fastboot flashing unlock

Finally did the trick!

UBP took over and installed Ubuntu Touch!

The automatically generated text for bug report is that :

UBports Installer 0.11.0 (snap)

• Environment
  • Ubuntu Core 20 linux 6.8.0-60-generic x64 NodeJS v20.18.3
• Device
  • amar_row_lte (Lenovo Tab M10 HD 2nd Gen LTE)
• Target OS
  • Ubuntu Touch

Settings

{"bootstrap":true,"partition":true,"wipe":true,"channel":"20.04/arm64/android9plus/stable"}

Log

info: Welcome to the UBports Installer version 0.11.0!
verbose: Running on: Ubuntu Core 20 linux 6.8.0-60-generic x64 NodeJS v20.18.3
verbose: Versions: {"node":"20.18.3","acorn":"8.14.0","ada":"2.9.2","ares":"1.34.4","base64":"0.5.2","brotli":"1.0.9","cjs_module_lexer":"1.4.1","cldr":"44.1","icu":"74.2","llhttp":"8.1.2","modules":"130","napi":"9","nghttp2":"1.61.0","openssl":"0.0.0","simdutf":"5.6.4","tz":"2024a","undici":"6.21.1","unicode":"15.1","uv":"1.46.0","uvwasi":"0.0.21","v8":"13.0.245.25-electron.0","zlib":"1.3.0.1-motley","electron":"33.4.11","chrome":"130.0.6723.191"}
verbose: Reading config file: undefined
command: exec: {"cmd":["heimdall","detect"],"error":{"message":"Command failed: heimdall detect\nERROR: Failed to detect compatible download-mode device.","code":1},"stderr":"ERROR: Failed to detect compatible download-mode device."}
command: exec: {"cmd":["adb","-P",5037,"kill-server"],"stderr":"cannot connect to daemon at tcp:5037: Connection refused"}
command: exec: {"cmd":["adb","-P",5037,"start-server"],"stderr":"* daemon not running; starting now at tcp:5037\n* daemon started successfully"}
command: exec: {"cmd":["heimdall","detect"],"error":{"message":"Command failed: heimdall detect\nERROR: Failed to detect compatible download-mode device.","code":1},"stderr":"ERROR: Failed to detect compatible download-mode device."}
command: exec: {"cmd":["fastboot","devices"],"stdout":"HPV41GPV\tfastboot"}
command: exec: {"cmd":["fastboot","devices"],"stdout":"HPV41GPV\tfastboot"}
command: exec: {"cmd":["fastboot","getvar","product"],"stderr":"product: amar_row_lte\nFinished. Total time: 0.000s"}
command: exec: {"cmd":["adb","-P",5037,"wait-for-any-any"],"error":{"message":"Command failed: adb -P 5037 wait-for-any-any","signal":"SIGTERM","killed":true}}
info: device detected: amar_row_lte
info: Installing Ubuntu Touch on your Lenovo Tab M10 HD 2nd Gen LTE (amar_row_lte)
info: configuring...
info: settings: {"bootstrap":true,"partition":true,"wipe":true,"channel":"20.04/arm64/android9plus/stable"}
verbose: running step {"actions":[{"adb:reboot":{"to_state":"bootloader"}}],"fallback":[{"core:user_action":{"action":"bootloader"}}]}
verbose: running adb action reboot
command: exec: {"cmd":["adb","-P",5037,"reboot","bootloader"],"error":{"message":"Command failed: adb -P 5037 reboot bootloader\nerror: no devices/emulators found","code":1},"stderr":"error: no devices/emulators found"}
debug: attempting to handle Error: no device
verbose: running core action user_action
verbose: running step {"actions":[{"fastboot:wait":null}]}
verbose: running fastboot action wait
command: exec: {"cmd":["fastboot","devices"],"stdout":"HPV41GPV\tfastboot"}
verbose: running step {"actions":[{"fastboot:wait":null}]}
verbose: running fastboot action wait
command: exec: {"cmd":["fastboot","devices"],"stdout":"HPV41GPV\tfastboot"}
verbose: running step {"actions":[{"fastboot:assert_var":{"variable":"unlocked","value":"yes"}}],"fallback":[{"core:user_action":{"action":"unlock_phone"}}]}
verbose: running fastboot action assert_var
command: exec: {"cmd":["fastboot","devices"],"stdout":"HPV41GPV\tfastboot"}
command: exec: {"cmd":["fastboot","getvar","unlocked"],"stderr":"unlocked: no\nFinished. Total time: 0.052s"}
debug: attempting to handle Error: Assertion error: expected bootloader variable unlocked to be yes but got no
verbose: running core action user_action
error: Error: uncaught exception at uncaughtException: TypeError: Cannot read properties of undefined (reading 'webContents')
stack trace: TypeError: Cannot read properties of undefined (reading 'webContents')
    at click (/snap/ubports-installer/463/app/resources/app.asar/src/lib/menuManager.js:106:37)
    at MenuItem.click (node:electron/js2c/browser_init:2:35295)
    at a._executeCommand (node:electron/js2c/browser_init:2:40710)

I tried again, just to make sure, with the "FASTBOOT mode" on before even starting UBP.

It still gets stuck saying "Waiting for device - Asserting unlocked bootloader variable" while the tablet says "=> FASTBOOT mode..."

@kugiigi Getting into "fastboot" is easy, sometimes the tablet goes into this mode on its own, just because I typed stuff on the pc. When I look at the tablet : "Hey, it's back into fastboot!"

But it's useless because there is no menu. There is just the text "=> FASTBOOT mode..." written in the bottom left corner of the screen. I cannot go anywhere from there. The "sound up" / "sound down" buttons don't make me scroll through any options, touching the screen does nothing.

UBPorts Installer is built upon Halium, I think.
I see no "halium" anywhere on my computer.
I read somewhere that the Halium version had to be the same as the Android version:

"Devices generally require a specific version of Android/stock rom to be installed. This depends on the halium version the port is build on. For example, if the port is based on halium 9, make sure you have Android version 9 installed before running the installer."

I have Android 11, but how do I check my halium version?

After letting Android finish it's update, it said :
"You have the latest system version
TB-X306X_S230973_240402_BMP"

In Settings :
I added "USB debugging (Debug mode when USB is connected)"
I cancelled "Verify apps over USB (Check apps installed via ADB/ADT for harmful behavior)"
I cancelled "Verify bytecode of debuggable apps (Allow ART to verify bytecode for debuggable apps)"

This didn't solve the current problem, but it solved the previous one : the tablet model not being detected.

I closed and reopened UBports Installer
Now it recognises the tablet, it says :
Lenovo Tab M10 HD Gen LTE (amar_row_lte)

In UBports Installer Tools / Developper tools :
"The installation stopped due to a problem (Oh, really?). You can choose to ignore this, or re-start the installation process.
If this continues to happen, please check if you are affected by a known bug. (known bug link not functionning)
Error: uncaught exception at uncaughtException: TypeError: Cannot read properties of undefined (reading 'webContents')

Well, I guess UBP can't check whether I really unlocked the bootloader, so it just hangs.

Third try with UBports Installer

I have a new Lenovo Tab M10 HD Gen 2 with Android 11. When I simply plug the tablet into the computer, the file manager gives me another name :"mtp://LENOVO_Lenovo_TB-X306X_HPV41GPV/"

I'm trying to install Ubuntu Touch with UBports Installer.
I manually selected "Lenovo Tab M10 Gen 2".
I kept default settings.
I double-checked the bootloader was unlocked.
I turned off the tablet and then held the "volume down" and the "power" button simultaneously until I got the message "=> FASTBOOT mode..."

I tried leaving the tablet plugged into the computer and I tried plugging it off then back in after it reboots into fastboot mode. No change.

I always get stuck at this stage. The tablet says "=> FASTBOOT mode...", UBports Installer says "Waiting for device - Asserting unlocked bootloader variable". And nothing else happens.

I waited for over an hour on the second try. Now I'm waiting again.

Any suggestion please?

What I expected? Basically, to get a tablet that will do what I want it to do and not what it "thinks" it should be doing. Stop the screen from going black at the slightest opportunity is going to be first. I'm sorry to hear apt won't function. Will snap function?