What to do with existing MMC partitions?

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System Details

  • Device: CYAN (ACER R11)
  • OS: Lubuntu
  • Firmware Type: UEFI Full ROM
  • Firmware Version: latest
  • Internal storage type: eMMC

Summary of the Issue

After manually modprobing `mmc_block` so that the installer sees the MMC, there’s the issue of “where to land”. In other words, the MMC has 12 partitions, some with ominous labels like “EFI”, “ROOTA”, “ROOTB”… and my hand trembles before nuking them.
Despite the fabulous coverage of many issues in MrChromebox, I didn’t find any mention of this: what are the “expendable” partitions ? And then, I suppose at some point I’ll need to choose an appropriate place for the grub boot sector to be written. Where should it land ?

Steps to Reproduce

  1. start Lubuntu installer from an USB key

  2. sudo modprobe mmc_block

  3. start the Partition Manager and see at least 12 partitions there.

  4. start the OS Installer; it asks to select among “wipe disk” “install alongside” and “replace”.

Thanks in advance,

-Alex