Thank you for taking the time to report this bug and helping to make
Ubuntu better.
Please could you provide an example of reproduction steps showing the
behaviour you're expecting working with "This worked fine until
recently"? Perhaps you'll need an older Ubuntu release, older kernel
package, or older net-tools package to do this. Once done, please change
the bug status back to New.
ifconfig is still maintained but deprecated in favour of ip(8). So while
this may well be a valid bug that we should fix, I don't think it is of
high importance any more, unless it is a regression caused by an update
in an existing stable release (and there's no evidence of that in your
report). So I'm setting Importance: Low for now.
** Changed in: net-tools (Ubuntu)
Status: New => Incomplete
** Changed in: net-tools (Ubuntu)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1828749
Title:
ifconfig dummy0 : Device not found
Status in net-tools package in Ubuntu:
Incomplete
Bug description:
Desired behavior:
The ifconfig command should be able to deal with the
dummy device. This worked fine until recently.
Observed behavior:
:; ifconfig dummy0
dummy0: error fetching interface information: Device not found
This problem appeared when I upgraded to bionic.
Highly informative workaround:
:; ip link add dummy0 type dummy
That command works, and makes the problem go away permanently.
The ifconfig command works fine after that.
The ifup and ifdown commands also work fine after that.
For convenient debugging, you can use the command:
:; ip link del dummy0 type dummy
which makes the problem come back.
You can also experiment with dummy1 et cetera.
Package ownership issues:
Compare: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=909204
That report was filed against ippusbxd, which is almost certainly
not the relevant package.
For that matter, I have no idea whether the root cause is in the
net-tools package or the kernel networking stack. All I know is
the ip command plays nicely with the kernel while the ifconfig
command does not.
Notes:
The kernel module for the dummy interface is preloaded in
all situations described here. That's not the issue.
An apport file is attached, to describe the environment.
Also, since you asked:
:; apt-cache policy net-tools
net-tools:
Installed: 1.60-26ubuntu1
Candidate: 1.60-26ubuntu1
Version table:
*** 1.60-26ubuntu1 500
500 http://ubuntu.cs.utah.edu/ubuntu xenial/main amd64 Packages
100 /var/lib/dpkg/status
:; lsb_release -rd
Description: Ubuntu 16.04.6 LTS
Release: 16.04
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