Comment # 5 on bug 1124423 from Mindaugas Baranauskas

Problem indeen seems to be this:

11:53:46 [0]: Python modules are not supported in this version of Calamares. 
11:53:46 [0]: Bad module type ( "job" ) or interface string ( "python" ) for
module  "mount" 
11:53:46 [1]: Module "mount@mount" cannot be created from descriptor. 
11:53:46 [0]: Python modules are not supported in this version of Calamares. 
11:53:46 [0]: Bad module type ( "job" ) or interface string ( "python" ) for
module  "unpackfs" 
11:53:46 [1]: Module "unpackfs@unpackfs" cannot be created from descriptor.