Tails Installer sometimes fails when setting partition type during (since Tails 3.6?)

Some users are reporting errors when trying to install or upgrade with Tails Installer. I still don’t have much information but the errors can be:

When installing to a new USB:

Partitionnement du périphérique /dev/sdd
g-dbus-error-quark: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.freedesktop.UDisks2.Partition' on object at path /org/freedesktop/UDisks2/block_devices/sdd1 (19)
L'installation de Tails a échoué !
g-dbus-error-quark: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.freedesktop.UDisks2.Partition' on object at path /org/freedesktop/UDisks2/block_devices/sdd1 (19)

Another log about a similar issue (note that /dev/sdb had no partition nor FS initially):

2018-04-01 11:13:11,060 [creator.py:856 (partition_device)] INFO: Speichermedium /dev/sdb wird partitioniert
2018-04-01 11:13:11,060 [creator.py:859 (partition_device)] DEBUG: Creating partition table
2018-04-01 11:13:13,565 [creator.py:879 (partition_device)] DEBUG: Creating partition
2018-04-01 11:13:14,169 [creator.py:279 (popen)] DEBUG: sync
2018-04-01 11:13:19,230 [creator.py:279 (popen)] DEBUG: sync
2018-04-01 11:13:25,426 [gui.py:264 (run)] ERROR: g-dbus-error-quark: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.freedesktop.UDisks2.Partition' on object at path /org/freedesktop/UDisks2/block_devices/sdb1 (19)
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/tails_installer/gui.py", line 203, in run
    self.live.partition_device()
  File "/usr/lib/python2.7/dist-packages/tails_installer/creator.py", line 924, in partition_device
    system_partition.call_set_type_sync(ESP_GUID, GLib.Variant('a{sv}', None))
Error: g-dbus-error-quark: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.freedesktop.UDisks2.Partition' on object at path /org/freedesktop/UDisks2/block_devices/sdb1 (19)
2018-04-01 11:13:25,428 [gui.py:265 (run)] DEBUG: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/tails_installer/gui.py", line 203, in run
    self.live.partition_device()
  File "/usr/lib/python2.7/dist-packages/tails_installer/creator.py", line 924, in partition_device
    system_partition.call_set_type_sync(ESP_GUID, GLib.Variant('a{sv}', None))
Error: g-dbus-error-quark: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.freedesktop.UDisks2.Partition' on object at path /org/freedesktop/UDisks2/block_devices/sdb1 (19)

Feature Branch: installer:bugfix/15432-installer-robustness, bugfix/15432-installer-robustness

Related issues

• Blocks #15139 (closed)

Original created by @emmapeel on 15432 (Redmine)