[Bug 1726852] [NEW] 17.10 recovery root session networking failure

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Hi,

I just freshly installed a machine with the new 17.10 desktop, and after
having trouble tried to fix that in a recovery root shell. When that did
not help to fix the problem ( #1726842 ), I reinstalled with Lubuntu,
which solved that problem for the moment.

But with both, Ubuntu and Lubuntu, I ran into the problem that the
recovery root shell is not working properly, it is not able to get the
network running properly. It took me severe manual manipulation in
/etc/network/interfaces and /etc/resolv.conf, to get the machine online.
I've identified three problems.


1. The machine tries to start the network through network-manager, which did not properly interact with systemd and it's nameserver at that state of boot process. Although the machine got an IP-address through DHCP, the configuration was not finished properly and aborted, due to some problem setting the DNS nameservers as passed from the DHCP server. 

2. There's error messages that a grep would not work on
/etc/resolv.conf, but I am not sure, where that error message came from.
However, the /etc/resolv.conf is a link to ../run/systemd/resolve/stub-
resolv.conf at that time, and the target does not exist at that time, so
the link is dangling and every attempt to read, grep, write must fail.

3. Another problem (and possibly the reason for 1 and 2) is that some
startup scripts complain about the missing ifconfig command. Indeed,
ifconfig is missing and not installed, I had to use ip to check the
interface configuration. Probably someone has taken ifconfig out of
standard installation, since ip is a full replacement and ifconfig
outdated, but there's still scripts and programs that want to use
ifconfig. Maybe that's why things go wrong.

** Affects: friendly-recovery (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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17.10 recovery root session networking failure
https://bugs.launchpad.net/bugs/1726852
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