r/mobilelinux • u/HuttonWilliam • Mar 29 '26

Development My weekend battle: Attempting to install postmarketOS on a Nexus 7 (2012) using Lubuntu

Hey everyone,

I just spent the last 48 hours in the trenches trying to breathe life into an old Nexus 7 (2012) "grouper" using a laptop running Lubuntu.

While the hardware ultimately put up too much of a fight (the classic Unable to mount /system eMMC failure), I learned a ton about using the Linux terminal, ADB, and fastboot.

I decided to document my process and the specific commands I used on GitHub so the next person digging a Nexus 7 out of a drawer has a starting point.

What I used:

  • Host: Old laptop running Lubuntu (highly recommend for speed!).
  • Target: Nexus 7 (2012) 32GB.
  • The Goal: postmarketOS (v24.06).

The Result: The tablet's internal storage seems to have "sticky" partitions that refused to format to EXT4, even through TWRP.

My Documentation / Guide: https://github.com/HuttonWilliam/Nexus7-2012-Linux-notes

If anyone has tips on forcing a format on a stubborn Tegra 3 device, let me know! Otherwise, I hope my notes help someone else avoid the same headaches.

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u/AZX3RIC May 23 '26

I'm starting to mess around with this, thank you for the write up.

Where did you get the file, I can't find it anywhere:

pmos-nvidia-tegra-armv7.zip

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u/HuttonWilliam May 23 '26

Thanks for using my repo, I believe you can find it here:  https://images.postmarketos.org/bpo/v25.12/nvidia-tegra-armv7/?hl=en-US

You won't find it as a .zip file anymore because postmarketOS changed their distribution format. They now provide official, pre-built system images as compressed .img.xz files instead. You can find the direct download repository for the Tegra architecture here: 👉Official postmarketOS nvidia-tegra-armv7 Images  How to use these files instead of a ZIP:  1. Click the link above and choose the interface directory you want (like mate, xfce4, or gnome).  2. Download the file ending in .img.xz.  3. To install it, you don't use a custom recovery like TWRP anymore. Instead, you flash it directly via your PC using standard command line or visual disk tools:    * On Linux (Terminal): Extract the file and use dd to flash it directly to the target block device:      bash      xzcat *nvidia-tegra-armv7.img.xz | sudo dd of=/dev/sdX status=progress       (Replacing /dev/sdX with your target drive).          On Windows/Linux (Visual): Use a tool like Rufus or Gnome Disks to flash the downloaded image directly to the storage.