usbfs: process <pid> (mtp.so) did not claim interface 0 before use

I get this error message on ubuntu 18.4.
I believe there are two different problems. 

First problem could be that InternalSD is readonly to the MTP process on the 
phone (see last line in log), why? 
Read-only requests worked.

The other problem are the failed read attempts with varying errno, see
below.

Log from phone is:

05-28 15:32:02.505 D/MtpService(3263): Adding MTP storage 0x10001 at 
/storage/emulated/0
05-28 15:32:02.505 D/MtpService(3263): Adding MTP storage 0xa5bf0001 at 
/storage/7743-14FD
05-28 15:32:02.505 D/MtpService(3263): starting MTP server in MTP mode with 
storage /storage/emulated/0 disabled
05-28 15:32:13.094 E/MtpServer(3263): request read returned -1, errno: 5
05-28 15:32:13.551 D/MtpService(3263): starting MTP server in MTP mode with 
storage /storage/emulated/0
05-28 15:32:13.558 D/MtpService(3263): Adding MTP storage 0xa5bf0001 at 
/storage/7743-14FD
05-28 15:32:13.558 D/MtpService(3263): Adding MTP storage 0x10001 at 
/storage/emulated/0
05-28 15:32:26.711 E/MtpServer(3263): request read returned -1, errno: 5
[ above repeated several times. ]

05-28 15:35:30.269 D/MtpService(3263): Adding MTP storage 0xa5bf0001 at 
/storage/7743-14FD
05-28 15:35:30.270 D/MtpService(3263): Adding MTP storage 0x10001 at 
/storage/emulated/0
05-28 15:35:53.914 E/MtpServer(3263): deletePath stat failed for 
/storage/emulated/0/DCIM/Camera/IMG_20180519_202734.jpg: No such file or 
directory
[repeated for each file]

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https://bugs.launchpad.net/bugs/1700649

Title:
  MTP device fails to mount

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