I had the same problem (as described in the first posting), sudo dot -c
worked for me on Ubuntu 14.04.1 LTS Trusty (tested with png and ps).
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https://bugs.launchpad.net/bugs/1349026
I have the impression that now since a few days linkedin works again 'at normal
speed'
(on the same Lucid installation and in the same network where it took an
eternity before).
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linkedin very slow on Firefox Linux only
https://bugs.launchpad.net/bugs/314713
You received this bug
I see the same problem: but only in my home network (in a different wireless
network, with the very same computer, signing in seems
to work reasonably fast). I start to suspect that this is related to Bug
#417757 (which I'm also suffering from as my ADSL modem
seems not to relay IPV6 DNS
