[Bug 1542389] [NEW] ubuntu-installer drops network connection when trying to configure a second network device

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== 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.

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-136520 severity-medium targetmilestone-inin1604
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ubuntu-installer drops network connection when trying to configure a second network device
https://bugs.launchpad.net/bugs/1542389
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