dokku: problem on ubuntu arm

root@server:~# uname -a
Linux server 4.0.0-200 #1 SMP Mon Apr 13 13:54:58 UTC 2015 armv7l armv7l armv7l GNU/Linux

when I do DOKKU_TAG=v0.3.23 bash bootstrap.sh

root@server:~# DOKKU_TAG=v0.3.23 bash bootstrap.sh
Preparing to install v0.3.23 from https://github.com/progrium/dokku.git...
Ign http://mirror.cloud.online.net trusty InRelease
Ign http://ports.ubuntu.com trusty-security InRelease                          
Hit http://ports.ubuntu.com trusty-security Release.gpg                        
Hit http://ports.ubuntu.com trusty-security Release                            
Hit http://mirror.cloud.online.net trusty Release.gpg                          
Hit http://mirror.cloud.online.net trusty Release                              
Get:1 http://apt.syncthing.net syncthing InRelease [8,836 B]                   
Hit http://ports.ubuntu.com trusty-security/main armhf Packages                
Hit http://ports.ubuntu.com trusty-security/universe armhf Packages            
Hit http://mirror.cloud.online.net trusty/main armhf Packages                  
Hit http://mirror.cloud.online.net trusty/universe armhf Packages              
Hit http://ports.ubuntu.com trusty-security/main Translation-en                
Hit http://mirror.cloud.online.net trusty/main Translation-en                  
Hit http://mirror.cloud.online.net trusty/universe Translation-en              
Hit http://ports.ubuntu.com trusty-security/universe Translation-en            
Ign http://mirror.cloud.online.net trusty/main Translation-en_US               
Ign http://mirror.cloud.online.net trusty/universe Translation-en_US           
Hit http://repo.ajenti.org main InRelease                                      
Hit http://repo.ajenti.org main/main armhf Packages                            
Hit http://repo.ajenti.org main/ubuntu armhf Packages                       
Get:2 http://apt.syncthing.net syncthing/release armhf Packages [806 B]     
Ign http://apt.syncthing.net syncthing/release Translation-en_US               
Ign http://apt.syncthing.net syncthing/release Translation-en                  
Ign http://repo.ajenti.org main/main Translation-en_US              
Ign http://repo.ajenti.org main/main Translation-en
Ign http://repo.ajenti.org main/ubuntu Translation-en_US
Ign http://repo.ajenti.org main/ubuntu Translation-en
Get:3 http://get.docker.io docker InRelease  
Ign http://get.docker.io docker InRelease
Hit https://packagecloud.io trusty InRelease
Hit https://packagecloud.io trusty/main armhf Packages
Get:4 https://packagecloud.io trusty/main Translation-en_US
Hit http://get.docker.io docker Release.gpg        
Hit https://deb.nodesource.com trusty InRelease    
Hit https://deb.nodesource.com trusty/main Sources
Hit https://deb.nodesource.com trusty/main armhf Packages
Get:5 https://deb.nodesource.com trusty/main Translation-en_US
Ign https://packagecloud.io trusty/main Translation-en_US
Ign https://packagecloud.io trusty/main Translation-en
Hit http://get.docker.io docker Release
Ign https://deb.nodesource.com trusty/main Translation-en_US                   
Ign https://deb.nodesource.com trusty/main Translation-en                      
Fetched 9,642 B in 8s (1,092 B/s)                                              
W: Failed to fetch http://get.docker.io/ubuntu/dists/docker/Release  Unable to find expected entry 'main/binary-armhf/Packages' in Release file (Wrong sources.list entry or malformed file)

E: Some index files failed to download. They have been ignored, or old ones used instead.