MAAS node unable to resolve it’s own hostname

By tdihp

I’ve deployed a MAAS region/rack server, with the main eth interface connects to WAN and another connectes to a switch by using iptables as my MAAS-vlan with DHCP configured.

I’ve found myself unable to get storage information from both of my 2 machines (with different hardware), after hours of digging I’ve found that the name resolving has some error and the nodes were unable to resolve their own hostname when commissioning, which also made the commissioning process painfully long, since it’s waiting name-resolving to time out most of the time. (that’s a guess, but after I successfully logged into the box, ping pure-feline would take some 10 secs then throw an “unknown host” error)

I’m using MAAS Version 2.1.1+bzr5544-0ubuntu1 (16.04.1) and not sure how to debug this issue, please help, thanks.


How do I work with bugz command to automate through command line?

By Ramana Reddy

We have a local bugzilla site where I need to monitor the bugs whose status is changed.

By default if I use bugz get it redirects to

How would I change this to our local bugzilla site?

Also given a bug_id can we get a link to bug so that if we click on it, it opens that bug in the browser.

Thanks a lot in advance!!!


What reason would cause MAC address spoofing not to work?

By Drawninpictures

I was unable to find the solution to this here, or on Google.

I have followed the standard instructions to spoof your MAC address, readily available online in places such as:

  2. How do I change / spoof my MAC address and easily switch between multiple ones?
  3. How to change the MAC address of pc?

It never works. It used to work, actually. Then it just stopped working successfully. What happens: I can change it, using those instructions, but I can’t connect to any networks. Not any network at all. Something weird is going on in my operating system.


What is an appropriate infrastructure for Deep Learning?

By Hendrik

I work on Kaggle’s Galaxy Zoo competition with Keras/Tensorflow, but the huge amount of data (lot of images) sends my computer to limbo. Mine is a more or less ordinary PC (i5) with a generous 48GB of RAM albeit I am unable to utilize my GPU (my video card is not CUDA-compatible). I use Ubuntu&Anaconda combo.

The actual problem is that Python throws “Memory error” while reading in the images from disk to a stacked numpy array. Seemingly my memory is insufficient for the job and I could imagine that the same would be true for any serious task (of course, there are projects beyond MNIST-classification).

So, my question is, what is and how could I get an infrastucture capable of handling jobs of this scale? Actually, what is the real bottleneck here? Memory? The top Linux command shows only about 10% of memory usage in case the running Python process, which is curious.

Of course, I’m not on the level of institutional players so only reasonable costs are acceptable…


Is the Ubuntu 16.04.1 download from Canonical’s Website Corrupt?

By jimpix

I downloaded Ubuntu 16.04 LTS from Canonical’s website, but when I tried to create a bootable USB via Rufus, it told me that ISO Image Extraction failed. I later managed to create a bootable USB via Win32 Disk Manager, but on bootup, my computer said that the file was corrupt. I then downloaded Ubuntu 16.04 LTS from Canonical’s website again, but I got the same problem.

What do I do now? I have limited internet data, so should I try downloading another a flavor of Linux? If so which one? Debian looks cool to me. Mint is too Windows like. If there is anyway I can still get Ubuntu 16.04 LTS, then please let me know.


[SOLVED] LightDM does not show – only black screen and cursor

By (dimmuboy)

Hello there,
I had problem yesterday with login to system. LightDM does not show – only black screen and cursor. I tried some ussualy methods to solve problem but nothing worked.
I could not found any relevant error messages
from journalctl

Jan 18 23:08:33 Viruz50 lightdm[490]: g_object_unref: assertion ‘G_IS_OBJECT (object)’ failed
Jan 18 23:08:33 Viruz50 lightdm[694]: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
Jan 18 23:08:33 Viruz50 systemd[1]: Created slice system-systemdx2dcoredump.slice.
Jan 18 23:08:33 Viruz50 systemd[1]: Started Process Core Dump (PID 697/UID 0).
Jan 18 23:08:33 Viruz50 systemd[1]: Created slice User Slice of lightdm.
Jan 18 23:08:33 Viruz50 systemd[1]: Starting User Manager for UID 620…
Jan 18 23:08:33 Viruz50 systemd-logind[433]: New session c1 of user lightdm.
Jan 18 23:08:33 Viruz50 systemd[1]: Started Session c1 of user lightdm.
Jan 18 23:08:33 Viruz50 systemd[699]: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)

from systemctl status lightdm.service

Jan 19 08:26:27 Viruz50 lightdm[491]: g_object_unref: assertion ‘G_IS_OBJECT (object)’ failed

from /var/log/lightdm/lightdm.log

[+1.50s] CRITICAL: g_object_unref: assertion ‘G_IS_OBJECT (object)’ failed


Downgrade package webkit2gtk from version 2.14.2-2 to older solved my problem with black screen so you can try it if you have same problem.

I hope I’ll save few hours for someone.
Good luck!