I started to look at this problem from scratch since it's been a while since I have reported it....
It seems to go into emergency mode due to a failed attempt to start unit "tmp.mount" : # /var/log/boot.log 65 emergency.target: Enqueued job emergency.target/start as 159 66 tmp.mount: Unit entered failed state. Adding "systemd.mask=tmp.mount" in /tftpboot/pxelinux.cfg/default as a parameter did the trick to workaround the behaviour : APPEND initrd=bionic-desktop-amd64/initrd root=/dev/nfs boot=casper netboot=nfs nfsroot=192.168.100.2:/bionic-desktop-amd64 splash systemd.mask=tmp.mount systemd.debug-shell=1 systemd.log_level=debug systemd.log_target=console console=ttyS0,38400 console=tty1 -- Note: - I did the test by curiosity w/ Artful/17.10 (systemd-234) and it works, so it's possibly something between v234 and v237 which introduced the behaviour for tmp.mount, a change in mount, ... - Problem is also reproducible in Cosmic, and journalctl was a little bit more verbose in Cosmic than it was for Bionic in my testing : $ journalctl -a -u tmp.mount -- Logs begin at Wed 2018-10-10 20:15:36 UTC, end at Wed 2018-10-10 20:15:43 UTC. -- Oct 10 20:15:36 ubuntu systemd[1]: tmp.mount: Directory /tmp to mount over is not empty, mounting anyway. Oct 10 20:15:36 ubuntu systemd[1]: Mounting /tmp... Oct 10 20:15:36 ubuntu systemd[1]: tmp.mount: Mount process finished, but there is no mount. Oct 10 20:15:36 ubuntu systemd[1]: tmp.mount: Failed with result 'protocol'. Oct 10 20:15:36 ubuntu systemd[1]: Failed to mount /tmp. # src/core/mount.c 802 static void mount_enter_dead(Mount *m, MountResult f) { 803 assert(m); 804 805 if (m->result == MOUNT_SUCCESS) 806 m->result = f; 807 808 if (m->result != MOUNT_SUCCESS) 809 log_unit_warning(UNIT(m), "Failed with result '%s'.", mount_result_to_string(m->result)); ... 1282 switch (m->state) { 1283 1284 case MOUNT_MOUNTING: 1285 /* Our mount point has not appeared in mountinfo. Something went wrong. */ 1286 1287 if (f == MOUNT_SUCCESS) { 1288 /* Either /bin/mount has an unexpected definition of success, 1289 * or someone raced us and we lost. */ 1290 log_unit_warning(UNIT(m), "Mount process finished, but there is no mount."); 1291 f = MOUNT_FAILURE_PROTOCOL; 1292 } and m->result is indeed equalt to "MOUNT_FAILURE_PROTOCOL" ^ 1955 [MOUNT_FAILURE_PROTOCOL] = "protocol", I'll try to instrument things and create a custom ISO for further debugging/testing. This is where am at the moment. - Eric -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1755863 Title: netbooting the bionic live CD over NFS goes straight to maintenance mode : To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1755863/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs