Can't install Ubuntu Touch/Ubports on Nexus 7 flo.



  • I never thought that I would run out of ideas how to flash a device, but here I am.

    I was trying to flash Ubuntu Touch by Ubports to Nexus 7 flo, but have failed numerous times.
    Ubuntu-device-flash metod = downloads and pushes all but fail on ,, error, can't push to .cache, is a directory

    MDT fails at the same step

    Ubports installer downloads and pushes all files-according to screen reading and says Done!
    But again fails as you can see from the picture attached(N7 recovery)unlocked 10 + minutes and nothing happening

    I have tried that on Nexus 7 that base was on 5.1, 6.01 Lineage OS 7.1.2.
    Adb debbuging enabled, bootloader unlocked, freshly wiped.

    Anyone have any idea what's wrong.
    Btw, I have 3 Nexus 7 tablets, same on each one is happening.

    Thanks.0_1508067167660_1508067145550.jpg



  • What is the dimension of the cache partition?



  • @mihael I have no idea.



  • Look here
    Https://WWW.lucaswilliams.net/index.php/2017/02/11/install-ubuntu-on-bq-aquaris-m10-fhd /
    Called behind the eyes,explains partion sizes and how to change them



  • My Meizu Pro 5 came with Android and the cache partition was too small (496MB) so I had to increase it at 700MB in order to switch channel to rc-proposed back when I was using Canonical Ubuntu.



  • @Stefano
    drwxrwx--- 6 system cache 4096 Oct 14 17:56 cache



  • This post is deleted!


  • @mihael interesting, according to adb shell, my cache partition on Pro 5 is about the same size as on Nexus 7 4960 ??? Cos I had no problem to install on Pro 5.



  • What I have:
    df -h | grep cache
    result:
    /dev/disk/by-partlabel/cache 679M 3.2M 661M 1% /android/cache



  • @mihael this is from my Pro 5
    df -h | grep cache
    /dev/disk/by-partlabel/cache 496M 2.7M 484M 1% /android/cache

    and this is for Nexus 7 :
    df -h | grep cache
    /dev/block/mmcblk0p23 552M 10M 542M 2% /cache



  • Maybe people with more knowledge than me could say how much space you need on your cache partition for the files for your device. Depending on that you will know if you need to increase your cache partition space or if the problem is somewhere else.



  • Actually I just remembered that you can download the files on your computer without flashing them to the device and then you can check the total size needed. That is what I did and how I understood I needed a bigger cache partition. This way you will know if this is where the problem is or you are fine with the size of the cache partition and then the problem is somewhere else.



  • @mihael Thanks. Yes, it looks like the problem is with the cache. I'll increase the size and will try again.



  • @Marathon2422
    I was trying to do that, but got stuck with parted
    can't remove partition ,,userdata'' it says I need to unmount it but how??? Any idea?
    Error: Partition /dev/block/mmcblk0p30 is being used. You must unmount it before
    you modify it with Parted.



  • @Stefano said in Can't install Ubuntu Touch/Ubports on Nexus 7 flo.:

    block

    Have you tried to change the usb cable?



  • @Emanuele-Sorce this usb cable works perfectly with Nexus 5 and other devices, it's original Nexus cable, but I will try. Although I'm bit sceptic about it and think it's some other problem here.



  • @Stefano said in Can't install Ubuntu Touch/Ubports on Nexus 7 flo.:

    @Marathon2422
    I was trying to do that, but got stuck with parted
    can't remove partition ,,userdata'' it says I need to unmount it but how??? Any idea?
    Error: Partition /dev/block/mmcblk0p30 is being used. You must unmount it before
    you modify it with Parted.

    umount /dev/block/mmcblk0p30

    But I would be VERY surprised if you would actually have to change the cache partition size.

    I have a nexus 7 gsm "deb" which should be the same apart from the gsm module. I did not have to mock around with partitions. An operation I would be VERY nervous of attempting for fear that I might render the device unbootable.

    I guess it is possible to do it.And I'd be very curious to hear the report of someone trying .... but I don't wanna fo it myself.

    I can check the partitionsizes on my deb in a few hours.

    That all being said I can't actually offer a hypothesis why it would work for me, but not for you.



  • @doniks what's the difference between deb and flo, apart from deb has a sim funcionality? Do you think e.g. if you did a full TWRP backup of fresh install and share that backup with me, would it work on my flo? Then I could just reflash it. I did this method with Pro 5 and it worked, also some other users used it a it worked.



  • @Stefano said in Can't install Ubuntu Touch/Ubports on Nexus 7 flo.:

    @mihael Thanks. Yes, it looks like the problem is with the cache. I'll increase the size and will try again.

    Can you explain how EXACTLY you have determined that?

    Wrt to deb vs flo. Hearsay has it that the sim card is the only difference. A long time ago I installed a flo image and found that sound didn't work correctly.

    Wrt trwp backup. I guess we could try that. I could even flash a flo image first.

    Alternatively you could try to install "by hand". It's just my pet theory, I never really tried it, but I'm convinced installing is nothing but unpacking some archives into the right spot. Plus flashing the boot image. Not sure whether you can research that by yourself, otherwise I can try to do it in a few hours. Try searching for "ubuntu_command". I think that's what that install script is called that is run on the phone as part of uhm whatsitcalled ... ubuntu-device-flash ?!



  • @doniks I don't know, but that's what Terminal says every time I try to flash it either with ubuntu-device-flash or MDT or Ubports installer. It fails. I also tried a manually push the files to tablet and unpack it there, but again, no space left on device ( completely wiped before)
    I think the only way is to try to restore the full TWRP backup of freshly installed FLO or DEB image. If you wouldn't mind to share it with me, it would be great. I bet someone else will have a similar problem soon with Nexus 7 and by doing that you'll help a lot. Thanks btw.


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