Upgrade error: unable to find partition for path '/system'

[AnotherElk]

@Kimbert

my phone shows TWRP (3.1.1-0)

@AnotherElk

unable to find partition for path '\system'

As irritating as it is, this message was observed to be kind of a feature, not a bug, of the older TWRP version bundled with Fairphone’s OSes.

… with the mentioned older TWRP version being 3.1.1-0, which Fairphone maintained themselves. After issues in connection with Android 7 Fairphone dropped maintaining their own TWRP and bundled the stock Android recovery with their OSes again starting with OS version 19.11.2. …

@MaartenD

Improve user experience of future update installations (replace TWRP with AOSP recovery)

The community-maintained, up-to-date TWRP from twrp.me can still be installed and used by users favouring TWRP.

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@Alex.A

Would be curious to know how TWRP 3.3.1-0 arrived on your FP2 when upgrading to 19.11.2… Did you install it manually?

The original mention of 3.1.1-0 makes sense, since it came bundled with the Fairphone OS and Fairphone Open OS Android 7 releases at first.
When the update to 19.11.2 succeeds, TWRP should be gone, replaced with the stock Android recovery.