mtr no longer works as regular user: mtr: unable to get raw sockets.

[Marlin Cremers]

mtr used to work when being run as regular user. This is no longer the case: mtr: unable to get raw sockets.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: mtr-tiny 0.86-1
ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0
Uname: Linux 4.4.0-2-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.19.4-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Feb 7 02:45:28 2016
SourcePackage: mtr
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Brian Murray (brian-murray)]

I was unable to recreate this on Xenail using mtr version 0.86-1.

[Brian Murray (brian-murray)]

Could you add some more information about the steps you took to encounter this bug? Did you use any switches with mtr?

[Marlin Cremers (marlinc)]

Not really I just run 'mtr'.

For example:

marlinc@marlinc-laptop:~$ mtr 8.8.8.8
mtr: unable to get raw sockets.

[Haw Loeung (hloeung)]

Seems to be missing the cap_net_raw+ep file capability.

| hloeung@somebox:~$ sudo getcap /usr/bin/mtr
| [sudo] password for hloeung:
| hloeung@somebox:~$ sudo setcap cap_net_raw+ep /usr/bin/mtr
| hloeung@somebox:~$ sudo getcap /usr/bin/mtr
| /usr/bin/mtr = cap_net_raw+ep

So mtr.postinst not called with "configure"?

[Haw Loeung (hloeung)]

Re-installing the mtr package seems to have fixed it on our Ubuntu Archive servers.

[Marlin Cremers (marlinc)]

Reinstalling appeared to work. I have this 16.04 install since February so it could be a leftover issue.

[Haw Loeung (hloeung)]

Seen this on a fresh Xenial install:

hloeung@steelix:~$ apt-cache policy mtr-tiny
mtr-tiny:
  Installed: 0.86-1ubuntu0.1
  Candidate: 0.86-1ubuntu0.1
  Version table:
 *** 0.86-1ubuntu0.1 500