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Hacker News front page38 min readintermediate

Running Ubuntu on the Lenovo IdeaPad Duet

Read on vhaudiquet.frHN 98·39 comments

Summary

The author swaps postmarketOS for an Ubuntu rootfs on a Lenovo IdeaPad Duet, discovers the device boots via Depthcharge using a FIT image, and explains why a UEFI‑capable firmware like U‑Boot is needed to run Ubuntu's kernel.

  • Replacing the rootfs partition with an Ubuntu base tarball boots, but the device still uses the postmarketOS kernel from the Depthcharge FIT image.
  • Duet boot flow: ROM → Coreboot → ARM Trusted Firmware → Depthcharge → FIT image (kernel, initrd, DTB); no EFI is involved.
  • Ubuntu's kernel expects UEFI, so a UEFI‑capable firmware (U‑Boot) must be chainloaded from Depthcharge to boot Ubuntu.
  • U‑Boot already supports the mt8183 SoC; the remaining work is board‑specific panel init and creating a Depthcharge payload that loads U‑Boot.

Engineers wanting to run full Ubuntu on ARM Chromebooks need to understand the boot chain and how to introduce UEFI support.

7/10
linuxchromeosu bootarm64bootloader

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