WHen I select a multipath device I get 

                                                                                  ┌────────────────────────────────────────────────────────────────────────┐      │                                                                        │      │  Sorry, there was a problem completing the installation.               │      │                                                                        │      │  Information is being collected from the system that will help the     │      │  developers diagnose the report.                                       │      │                                                                        │      │                                 |--•--|                                │   : Removing leading `/' from member names                                     │
   └───────────────────────────────────tar: Removing leading `/' from hard link targets

                                                                                ┌────────────────────────────────────────────────────────────────────────┐      │                                                                        │      │  Sorry, there was a problem completing the installation.               │      │                                                                        │      │                       [ View full report      ]                        │      │                                                                        │      │  If you want to help improve the installer, you can send an error      │      │  report.                                                               │      │                                                                        │      │                       [ Send to Canonical     ]                        │      │                                                                        │      │  Do you want to try starting the installation again?                   │      │                                                                        │      │                       [ Restart the installer ]                        │      │                                                                        │      │                       [ Close report          ]                        │      │                                                                        │      └────────────────────────────────────────────────────────────────────────┘   
no way to go to shell and get the log nad crash info - it has been sent to canonical !!!
   │                       [Close report          ]                        │      │                                                                        │      └────────────────────────────────────────────────────────────────────────┘                                                                                   generating crash report
tar: Removing leading `/' from member names
tar: Removing leading `/' from hard link targets

                               
python error .....
and comes back to               
   ┌────────────────────────────────────────────────────────────────────────┐      │                                                                        │      │  Sorry, the installer has restarted because of an error.               │      │                                                                        │      │                       [ View full report      ]                        │      │                                                                        │      │  If you want to help improve the installer, you can send an error      │      │  report.                                                               │      │                                                                        │      │                       [ Send to Canonical     ]                        │      │                                                                        │      │  Select continue to try the installation again.                        │      │                                                                        │      │                       [tar: Removing leading `/' from member names     │
   │                                                                   tar: Removing leading `/' from hard link targets──────────────────────────────────────┘