[Bug 1542389] Comment bridged from LTC Bugzilla

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------- Comment From thorsten.diehl at de.ibm.com 2016-02-11 06:24 EDT-------
(In reply to comment #13)
> Installation guides are published at https://help.ubuntu.com/
>
> And we have published an early pre-release draft for xenial (16.04) there
> (follow 16.04 -> s390x).
>
> https://help.ubuntu.com/16.04/installation-guide/s390x/index.html
>

That's very useful, thanks a lot!!

> There are some mentions of expert mode, but there are no explicit warnings
> to "not use it".
>
> In general, the guide guides one without using it. In general, ubuntu/debian
> users/sysadmins do know about expert mode not being that much more useful
> and asking too many pointless questions.

Hmmm, anyway, please consider an appropriate wording - usually experts are installaing in "expert" mode, which is obviously not the recommended way.
> It is mentioned here
> https://help.ubuntu.com/16.04/installation-guide/s390x/ch06s01.html: If your
> hardware requires you to pass options to kernel modules as they are
> installed, you will need to start the installer in ?expert? mode. This can
> be done by either using the expert command to start the installer or by
> adding the boot argument priority=low. Expert mode gives you full control
> over debian-installer.
>
> Not sure if that is sufficient.
>
> I will close this bug report (w.r.t. installing with multiple networking
> connection) as an invalid one / user support. And if more inquiries w.r.t.
> expert mode arise, we may have to look into improving documentation and/or
> in-installer wording.

But I'm closing this bug on our side, too. Thank you for the
explanations.

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https://bugs.launchpad.net/bugs/1542389

Title:
  ubuntu-installer drops network connection when trying to configure a
  second network device

Status in debian-installer package in Ubuntu:
  Invalid

Bug description:
  == Comment: #0 - Thorsten Diehl <thorsten.diehl at de.ibm.com> - 2016-02-03 12:52:53 ==
  I IPLed a system (version 20101020ubuntu416), started the installer, configured a first network device with static IPv4 and connected via ssh to the installer.
  I chose "expert mode" and selected "Configure the network device" instead of continuing at "Choose language".
  I selected my second OSA device and accepted this configuration.
  Consequently I chose "Configure a network using static addressing" instead of continuing at the proposed "Choose language".
  And immediatedly this session wasn't reachable any more. A parallel ping to this session did stall at the moment, when I pressed "Configure a network using static addressing". Obviously this action dropped the default gateway - here the result when entereing a shell to debug the situation:
  ~ #>ip a s
  ip a s  
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue   
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00  
      inet 127.0.0.1/8 scope host lo  
         valid_lft forever preferred_lft forever  
      inet6 ::1/128 scope host   
         valid_lft forever preferred_lft forever  
  2: enccw0.0.f5f0: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast qlen 1000  
      link/ether 02:a2:0f:00:00:99 brd ff:ff:ff:ff:ff:ff  
      inet 9.152.162.103/22 brd 9.152.163.255 scope global enccw0.0.f5f0  
         valid_lft forever preferred_lft forever  
  3: enccw0.0.b1c6: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000  
      link/ether 02:00:00:5b:9f:69 brd ff:ff:ff:ff:ff:ff  
  ~ #>ip r l
  ip r l  
  ~ #>
  The network interfaces are both down, and thus all routes were lost!!
  When I bring up the first interface manually
  ip link set enccw0.0.f5f0 up
  and add the route and the default gw:
  ip route add 9.152.160.0/22 via 9.152.160.1
  ip route add default via 9.152.160.1
  I can continue with the IP configuration of the second network interface

  == Comment: #4 - Thorsten Diehl <thorsten.diehl at de.ibm.com> -
  2016-02-04 08:34:29 ==

  
  == Comment: #5 - Thorsten Diehl <thorsten.diehl at de.ibm.com> - 2016-02-04 08:36:21 ==
  I revived the first network interface as described above to get access to the system and to collect the data.

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