NebulaChatForkDesktopUbuntu

Built a debug tdesktop_ubuntu for the first time.

Use 12345 as the default SMS password / verification code.

A standard test API id / API hash are used, hence typed as a pre-release. Also, the executable erroneously tells that it is an official app, where it is not, as the IP address and keys of a cloud are unofficial — i.e. the app's cloud is unofficial, and this app is unofficial.