[Bug 2146562] Re: [26.04] East Asian languages show tofu (□□□) in Subiquity installer on arm64

[Thunder WANG]

** Attachment added: "App Center displays tofu for east Asia language.  version: 26.04 beta arm64."
   https://bugs.launchpad.net/ubuntu-desktop-provision/+bug/2146562/+attachment/5956426/+files/app-center-tofu.jpg

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Title:
  [26.04] East Asian languages show tofu (□□□) in Subiquity installer on
  arm64

Status in ubuntu-desktop-provision:
  New
Status in subiquity package in Ubuntu:
  New

Bug description:
  * ISO: ubuntu-26.04-beta-desktop-arm64.iso (2026-03-26)
  * Step: Boot into installer, try to select Chinese or Japanese
  * Expected: Normal text
  * Actual: All characters are tofu/boxes
  * Note: English locale works fine.

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