Booting with "systemd.log_level=debug" revealed:
Dec 18 17:26:22 ubuntu systemd-udevd[1326]: value '[dmi/id]sys_vendor' is 'QEMU' Dec 18 17:26:22 ubuntu systemd-udevd[1326]: created db file '/run/udev/data/b7:2' for '/devices/virtual/block/loop2' Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Changed dead -> tentative Dec 18 17:26:22 ubuntu systemd-udevd[1326]: created db file '/run/udev/data/b7:2' for '/devices/virtual/block/loop2' Dec 18 17:26:22 ubuntu systemd-udevd[1326]: passed 293 byte device to netlink monitor 0x557a8c0f8680 Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Changed dead -> tentative ... Dec 18 17:26:22 ubuntu systemd[1120]: sys-devices-virtual-block-loop2.device: Changed dead -> plugged Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Changed tentative -> plugged Dec 18 17:26:22 ubuntu systemd-udevd[529]: passed 179 byte device to netlink monitor 0x557a8c0c7bc0 Dec 18 17:26:22 ubuntu systemd[1]: sys-devices-virtual-block-loop2.device: Changed dead -> plugged Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Changed tentative -> plugged ... Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/dev_2dloop2_2edevice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1009 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/dev_2dloop2_2edevice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1010 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a ... Dec 18 17:26:22 ubuntu systemd-udevd[1328]: created db file '/run/udev/data/b7:2' for '/devices/virtual/block/loop2' Dec 18 17:26:22 ubuntu systemd-udevd[1328]: created db file '/run/udev/data/b7:2' for '/devices/virtual/block/loop2' Dec 18 17:26:22 ubuntu systemd-udevd[1328]: passed 252 byte device to netlink monitor 0x557a8c0f8680 Dec 18 17:26:22 ubuntu systemd[1]: sys-devices-virtual-block-loop2.device: Installed new job sys-devices-virtual-block-loop2.device/nop as 412 Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Installed new job dev-loop2.device/nop as 413 Dec 18 17:26:22 ubuntu systemd[1]: sys-devices-virtual-block-loop2.device: Changed plugged -> dead Dec 18 17:26:22 ubuntu systemd[1120]: sys-devices-virtual-block-loop2.device: Installed new job sys-devices-virtual-block-loop2.device/nop as 14 Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Changed plugged -> dead Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Installed new job dev-loop2.device/nop as 15 Dec 18 17:26:22 ubuntu systemd[1120]: sys-devices-virtual-block-loop2.device: Changed plugged -> dead Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/dev_2dloop2_2edevice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1028 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Changed plugged -> dead Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/dev_2dloop2_2edevice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1029 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Job dev-loop2.device/nop finished, result=done Dec 18 17:26:22 ubuntu systemd[1120]: sys-devices-virtual-block-loop2.device: Job sys-devices-virtual-block-loop2.device/nop finished, result=done Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/sys_2ddevices_2dvirtual_2dblock_2dloop2_2edevice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1030 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Dec 18 17:26:22 ubuntu systemd[1120]: sys-devices-virtual-block-loop2.device: Collecting. Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/sys_2ddevices_2dvirtual_2dblock_2dloop2_2edevice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1031 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Collecting. Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=JobNew cookie=1032 reply_cookie=0 signature=uos error-name=n/a error-message=n/a Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=JobNew cookie=1033 reply_cookie=0 signature=uos error-name=n/a error-message=n/a Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Job dev-loop2.device/nop finished, result=done Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=JobRemoved cookie=1034 reply_cookie=0 signature=uoss error-name=n/a error-message=n/a Dec 18 17:26:22 ubuntu systemd[1]: sys-devices-virtual-block-loop2.device: Job sys-devices-virtual-block-loop2.device/nop finished, result=done Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=JobRemoved cookie=1035 reply_cookie=0 signature=uoss error-name=n/a error-message=n/a Dec 18 17:26:22 ubuntu systemd[1]: sys-devices-virtual-block-loop2.device: Collecting. Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Collecting.
Booting with "systemd. log_level= debug" revealed:
Dec 18 17:26:22 ubuntu systemd- udevd[1326] : value '[dmi/id] sys_vendor' is 'QEMU' udevd[1326] : created db file '/run/udev/ data/b7: 2' for '/devices/ virtual/ block/loop2' udevd[1326] : created db file '/run/udev/ data/b7: 2' for '/devices/ virtual/ block/loop2' udevd[1326] : passed 293 byte device to netlink monitor 0x557a8c0f8680 virtual- block-loop2. device: Changed dead -> plugged virtual- block-loop2. device: Changed dead -> plugged freedesktop/ systemd1/ unit/dev_ 2dloop2_ 2edevice interface= org.freedesktop .DBus.Propertie s member= PropertiesChang ed cookie=1009 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a freedesktop/ systemd1/ unit/dev_ 2dloop2_ 2edevice interface= org.freedesktop .DBus.Propertie s member= PropertiesChang ed cookie=1010 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a udevd[1328] : created db file '/run/udev/ data/b7: 2' for '/devices/ virtual/ block/loop2' udevd[1328] : created db file '/run/udev/ data/b7: 2' for '/devices/ virtual/ block/loop2' udevd[1328] : passed 252 byte device to netlink monitor 0x557a8c0f8680 virtual- block-loop2. device: Installed new job sys-devices- virtual- block-loop2. device/ nop as 412 device/ nop as 413 virtual- block-loop2. device: Changed plugged -> dead virtual- block-loop2. device: Installed new job sys-devices- virtual- block-loop2. device/ nop as 14 device/ nop as 15 virtual- block-loop2. device: Changed plugged -> dead freedesktop/ systemd1/ unit/dev_ 2dloop2_ 2edevice interface= org.freedesktop .DBus.Propertie s member= PropertiesChang ed cookie=1028 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a freedesktop/ systemd1/ unit/dev_ 2dloop2_ 2edevice interface= org.freedesktop .DBus.Propertie s member= PropertiesChang ed cookie=1029 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a device/ nop finished, result=done virtual- block-loop2. device: Job sys-devices- virtual- block-loop2. device/ nop finished, result=done freedesktop/ systemd1/ unit/sys_ 2ddevices_ 2dvirtual_ 2dblock_ 2dloop2_ 2edevice interface= org.freedesktop .DBus.Propertie s member= PropertiesChang ed cookie=1030 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a virtual- block-loop2. device: Collecting. freedesktop/ systemd1/ unit/sys_ 2ddevices_ 2dvirtual_ 2dblock_ 2dloop2_ 2edevice interface= org.freedesktop .DBus.Propertie s member= PropertiesChang ed cookie=1031 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a freedesktop/ systemd1 interface= org.freedesktop .systemd1. Manager member=JobNew cookie=1032 reply_cookie=0 signature=uos error-name=n/a error-message=n/a freedesktop/ systemd1 interface= org.freedesktop .systemd1. Manager member=JobNew cookie=1033 reply_cookie=0 signature=uos error-name=n/a error-message=n/a device/ nop finished, result=done freedesktop/ systemd1 interface= org.freedesktop .systemd1. Manager member=JobRemoved cookie=1034 reply_cookie=0 signature=uoss error-name=n/a error-message=n/a virtual- block-loop2. device: Job sys-devices- virtual- block-loop2. device/ nop finished, result=done freedesktop/ systemd1 interface= org.freedesktop .systemd1. Manager member=JobRemoved cookie=1035 reply_cookie=0 signature=uoss error-name=n/a error-message=n/a virtual- block-loop2. device: Collecting.
Dec 18 17:26:22 ubuntu systemd-
Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Changed dead -> tentative
Dec 18 17:26:22 ubuntu systemd-
Dec 18 17:26:22 ubuntu systemd-
Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Changed dead -> tentative
...
Dec 18 17:26:22 ubuntu systemd[1120]: sys-devices-
Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Changed tentative -> plugged
Dec 18 17:26:22 ubuntu systemd-udevd[529]: passed 179 byte device to netlink monitor 0x557a8c0c7bc0
Dec 18 17:26:22 ubuntu systemd[1]: sys-devices-
Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Changed tentative -> plugged
...
Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/
Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/
...
Dec 18 17:26:22 ubuntu systemd-
Dec 18 17:26:22 ubuntu systemd-
Dec 18 17:26:22 ubuntu systemd-
Dec 18 17:26:22 ubuntu systemd[1]: sys-devices-
Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Installed new job dev-loop2.
Dec 18 17:26:22 ubuntu systemd[1]: sys-devices-
Dec 18 17:26:22 ubuntu systemd[1120]: sys-devices-
Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Changed plugged -> dead
Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Installed new job dev-loop2.
Dec 18 17:26:22 ubuntu systemd[1120]: sys-devices-
Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/
Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Changed plugged -> dead
Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/
Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Job dev-loop2.
Dec 18 17:26:22 ubuntu systemd[1120]: sys-devices-
Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/
Dec 18 17:26:22 ubuntu systemd[1120]: sys-devices-
Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/
Dec 18 17:26:22 ubuntu systemd[1120]: dev-loop2.device: Collecting.
Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/
Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/
Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Job dev-loop2.
Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/
Dec 18 17:26:22 ubuntu systemd[1]: sys-devices-
Dec 18 17:26:22 ubuntu systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/
Dec 18 17:26:22 ubuntu systemd[1]: sys-devices-
Dec 18 17:26:22 ubuntu systemd[1]: dev-loop2.device: Collecting.