[Bug 1797839] Re: Ubuntu 18.04 LTS - ltsp clients lost network connection after tftp boot and network service start

[Alkis Georgopoulos]

You're using the stock Ubuntu LTSP version.
A systemd or network-manager update probably broke it.
I don't think it's a bug in systemd or network-manager; but that update triggered a bug in LTSP that wasn't triggered previously.

I don't know of anyone maintaining the stock Ubuntu LTSP version.

I'm an LTSP developer and I maintain newer versions of LTSP for Ubuntu in this PPA:
https://launchpad.net/~ts.sch.gr/+archive/ubuntu/ppa

If you add that PPA in your sources, both in the server and the chroot,
and fully update, the problem you saw will probably go away.

I do mention adding the PPA in the recommended LTSP installation instructions:
http://wiki.ltsp.org/wiki/Installation/Ubuntu

If someone wants to backport a newer LTSP version into stock Ubuntu repositories, he should follow the documentation at https://wiki.ubuntu.com/UbuntuBackports.
Due to lack of time I'm not going to do it, but I'm willing to help anyone that is interested in continuously backporting newer LTSP versions into LTS Ubuntu versions.

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https://bugs.launchpad.net/bugs/1797839

Title:
  Ubuntu 18.04 LTS - ltsp clients lost network connection after tftp
  boot and network service start

Status in ltsp package in Ubuntu:
  Incomplete

Bug description:
  Hi,

  we are using ltsp environment in Ubuntu 18.04 LTS. Something goes
  wrong with last package updates. I have fully updated the system and
  the client images on September 22nd. The LTSP environment worked and
  everything was fine. I made another full system update on October
  13rd. The update includes:

  on ltsp server:
  apt update
  apt upgrade 
  reboot

  on client images:
  ltsp-chroot -a amd64 /bin/bash
  apt update 
  apt upgrade
  exit

  on ltsp server:
  ltsp-update-image amd64

  after this procedure the ltsp clients boot never more. The tftp boot
  works, but when the client mounts the squashfs system and runs the
  systemd job Network service, the boot hangs. Until the network service
  start, the ltsp thin client reply on ping, after Network service
  starts the ping stops.

  I tested this behaviour on two indepent ltsp instalations. The behaviour is the same on both sites. THere is no difference between thin or fat client config.
  When I turned to last working image with 

  ltsp-update-image -r amd64

  then the clients started to boot again. Therefore I suppose, that some
  update between September 22nd and October 13rd broke the Network
  service in ltsp client.

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