Есть ли способ установить среду рабочего стола Deepin в Ubuntu 19.04?

Я недавно попытался установить Deepin Desktop Environment (DDE) в недавно выпущенной Ubuntu 19.04 ... и потерпел неудачу. Я использовал команду sudo add-apt-repository ppa:leaeasy/dde и получил эти ошибки:

Err:13 http://ppa.launchpad.net/elementary-os/stable/ubuntu disco Release      
  404  Not Found [IP: 91.189.95.83 80]
Err:14 http://ppa.launchpad.net/leaeasy/dde/ubuntu disco Release
  404  Not Found [IP: 91.189.95.83 80]
Get:15 http://gb.archive.ubuntu.com/ubuntu disco-updates/main amd64 DEP-11 Metadata [72.2 kB]
Err:16 http://ppa.launchpad.net/noobslab/icons/ubuntu disco Release
  404  Not Found [IP: 91.189.95.83 80]
Err:17 http://ppa.launchpad.net/ravefinity-project/ppa/ubuntu disco Release    
  404  Not Found [IP: 91.189.95.83 80]
Get:18 http://gb.archive.ubuntu.com/ubuntu disco-updates/main DEP-11 48x48 Icons [4,448 B]
Get:19 http://gb.archive.ubuntu.com/ubuntu disco-updates/main DEP-11 64x64 Icons [5,852 B]
Get:20 http://gb.archive.ubuntu.com/ubuntu disco-updates/universe amd64 DEP-11 Metadata [8,744 B]
Get:21 http://gb.archive.ubuntu.com/ubuntu disco-updates/universe DEP-11 48x48 Icons [6,157 B]
Get:22 http://gb.archive.ubuntu.com/ubuntu disco-backports/universe amd64 DEP-11 Metadata [7,164 B]
Reading package lists... Done                
E: The repository 'http://ppa.launchpad.net/elementary-os/stable/ubuntu disco Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://ppa.launchpad.net/leaeasy/dde/ubuntu disco Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://ppa.launchpad.net/noobslab/icons/ubuntu disco Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://ppa.launchpad.net/ravefinity-project/ppa/ubuntu disco Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Я их искал и не могу найти в интернете никакой информации об этих ошибках, и я относительно новичок в Linux. Спасибо за любую помощь.