deepin-terminal not listed in x-terminal-emulator

[MAWSpitau]

Description: Ubuntu Focal Fossa (development branch)
Release: 20.04

deepin-terminal:
  Installiert: 5.0.0+ds1-1
  Installationskandidat: 5.0.0+ds1-1
  Versionstabelle:
 *** 5.0.0+ds1-1 500
        500 http://de.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status

Expectation:

- I want to use deepin-terminal as default terminal application on i3wm.
- It has to be set as x-terminal-emulator
- I wanted to set it with:

> sudo update-alternatives --config x-terminal-emulator

But it does not show deepin-terminator.