Hey,
I have tried to use the webinstaller on ubuntu 22.04 with brave but it did not work
First it said
Error: Failed to execute 'open' on 'USBDevice': Access denied.
therefore I was reading this talk
https://discuss.grapheneos.org/d/6549-error-failed-to-execute-open-on-usbdevice-access-denied
after trying everyting it now says:
Error: Failed to execute 'requestDevice' on 'USB': No device selected.

Now I had no clue what to do and I tried the commandline way.
I had the feeling, that everything is working fine until that point:
Flashing factory images
there the commandline is telling me
bash: ./flash-all.sh: Datei oder Verzeichnis nicht gefunden

What can I do now?

    Good day. Have you been able to resolve this yet? Use the stock usb-c to usb-c cable that came packaged with your phone and try another port if possible.

    Dani98 'bash: ./flash-all.sh: Datei oder Verzeichnis nicht gefunden' or 'File or directory not found'

    May be related to your locale settings, potentially

      No, unfortunately not yet.

      I have tried the Webinstaller again.
      https://grapheneos.org/install/web#enabling-oem-unlocking
      When I go to systems Settings, the OEM unlock is grey and it says Bootloadder is already unlocked.
      I am assuming that this is ok.

      Maybe flashing as non root is the problem,
      https://grapheneos.org/install/web#flashing-as-non-root
      When I type "android-sdk-platform-tools-common" into the terminal, I get the following response:
      android-sdk-platform-tools-common: Command not found.
      However, if I go to the Ubuntu Software Center, I can see that Android SDK Manager is already installed. It is Version 1.2.1.2 A few weeks ago I also installed LineageOS on a older Phone. Therefore I guess that it works.

      I have skiped this one: https://grapheneos.org/install/web#working-around-fwupd-bug-on-linux-distributions
      since my fwupd version is 1.9.13

      Booting into bootloader worked
      https://grapheneos.org/install/web#booting-into-the-bootloader-interface
      As long as the telephone is working normal, a Telephone Symbol is at my Ubuntu Task, after booting into bootloader the telephone symbol disapears.
      last time i was using the original google cable, now I am using another one which is twice as thick as the original one.
      The Pixel6a now says in red "Fastboot Mode" and also in red "unlocked"

      I am not 100% sure what to do here: https://grapheneos.org/install/web#connecting-device
      I dont know how I can check if my udev ruless are ok?

      and now the trouble beginns:
      https://grapheneos.org/install/web#unlocking-the-bootloader
      this time again the website says:
      Error: Failed to execute 'open' on 'USBDevice': Access denied.
      therefore I have unpluged the phone and pluged it again
      nothing changed
      I have reloaded the website,
      nothing changed
      I have changed the cable to the original google cable
      nothing changed

        Now I restarted the computer while the device is connected,
        nothing changed

        now I started the device (leaving) the fastboot mode I unlocked the screen and set the screen lock to 30 minutes
        The Phone symbol apears again at the task

        If I press the unlock bootloader button now, a window opens and that window says "no compatible device found"
        after closing the window the website says in red:
        "Error: Failed to execute 'requestDevice' on 'USB': No device selected."
        the same happens if I press the "Download releasse" Button

        The USB connection settings say
        "controlled by *this device"
        and
        "not data transfer"

        if I change it to "file transfer", nothing changes

        if I try to change to "USB controlled by connected device" the Pixel 6a says "Couldnt change"

        if I open the terminal and type "adb devices" there is no device listed
        Now I have activated USB-Debuging and the command "adb devices" is showing my device

        after that, I have closed the terminal and tried again the grapheneOS webinstaller, but nothing changed ...

        raccoondad May be related to your locale settings, potentially

        Do you have any idea what the settings could be?

        Although Chromium is explicitly not recommended in the "Prerequisites", I tested Chromium.
        I had previously deactivated all extensions and disabled safe browsing.
        There was a little progress.
        The Pixel 6a was displayed once when I pressed the "Unlock Bootloader" button and the small window opened.
        When I selected it, the same error message came up again. When I pressed the button again, the window was empty again :-(

        First of all, make sure Brave isn't installed as a snap/flatpak package. These packaging formats won't work. Brave shields should be disabled too. The fastboot screen is the place to be throughout the process. To fix this:

        Dani98 Error: Failed to execute 'open' on 'USBDevice': Access denied.

        Open a terminal, enter
        sudo apt install android-sdk-platform-tools-common
        Nothing else is needed on this front, you shouldn't come across it again.

          Now I have also tried a USB-C to USB-A Cable,
          Nothing changed...
          If I turn on the Data Transfer on the phone, I can access the Phones storage, therefore I guess that the cabels are ok.

          That should do yes. You should also factory reset your phone again, I know you've done that already, but I mean for the purpose of having a clean state to work with. I'm not sure if all these settings you've changed could interfer, so it's best to start from scratch.

          The stock cable is sufficient so try another port too, and remember if you have another Android phone accessible to you that's fairly up to date, you can install from that as well.

          WOW

          that was working!

          a little

          Flashing factory images
          The initial install will be performed by flashing the factory images. This will replace the existing OS installation and wipe all the existing data.

          Flash release
          Wait for the flashing process to complete. It will automatically handle flashing the firmware, rebooting into the bootloader interface, flashing the core OS, rebooting into the userspace fastboot mode, flashing the rest of the OS and finally rebooting back into the bootloader interface. Avoid interacting with the device until the flashing script is finished and the device is back at the bootloader interface. Then, proceed to locking the bootloader before using the device as locking wipes the data again.

          Restarting device...

          The device was restarting once and now the resstarting bar is loaded completely but the device does not restart

          nothing happened therefore i pressed start on the phone
          after that it made a reboot and said the phone is corupted
          now it displays the google logo and nothing is happening again
          :-(

          now i have longe pressed the power button, so that the phone was turned of
          then I turnded on again and booted into the fastboot mode again
          then I restarted the procedure again and it got stuck again at the same point as before (see screenshot)

          We're doing progress. Start over by booting back into fastboot (the bootloader interface), connect to another port, ideally one at the back of your computer (if you're on a desktop). And of course via the stock cable.

          The phone is in Fastboot Mode (red triangle and red text Fastboot Mode) then a lot of other text in white and in the lower 1/4 Device stats: unlocked (in red)

          Before I have been using the USB-C to USB-A cable, now I switched to the original USB-C cable and a USB-C port of the Laptop (before it was at a USB-A port

          I did the procedure again, the phone was restarting once like it did before.
          Then the bar at the brave browser was loading like before but then it did not get stuck at the end, instead it showed an error message:
          Error: Failed to execute 'claimInterface' on 'USBDevice': Unable to claim interface.

          i have another android phone runnig iodeOS, should I try that one?
          Which browser should I use there?