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Black Hat youtube videos

July 13, 2014 Leave a comment
Categories: Uncategorized Tags: ,

Gmail users have an extra email address

July 12, 2014 Leave a comment

TIL that if you have a Gmail address (e.g. name@gmail.com), then you also have a name@googlemail.com address. Give it a try. Send something to your googlemail.com address, and it will be delivered to you gmail.com inbox.

This tip is from here.

Categories: google Tags: ,

my current Ubuntu wallpaper

July 11, 2014 Leave a comment

broken_windows-wallpaper-1920x1080

Categories: fun, ubuntu, windows Tags:

machine shuts down, then restarts in a few seconds

July 11, 2014 Leave a comment

Problem
My new desktop machine has a strange behaviour. It shuts down normally, but after a few seconds it restarts automatically.

Solution
I found the solution here. In short:

Edit the file “/etc/default/grub” and modify this line:

GRUB_CMDLINE_LINUX_DEFAULT="acpi=noirq quiet splash"

The new thing is the “acpi=noirq” part. Don’t forget to run “sudo update-grub” at the end.

It solved the problem but when I hit the SPACE button on the keyboard, the machine wakes up as if I had pressed the power button. Strange, but maybe it’s normal for new machines.

Categories: ubuntu Tags: , ,

open links in okular with Firefox

July 10, 2014 Leave a comment

Problem
You have a PDF that contains links. You click on a link but it opens in a strange browser (Konqueror?). How to open links with Firefox?

Solution

  1. Run the command “kcmshell4 filetypes“. File Associations – KDE Control Module will open.
  2. Search for html and select the file type text/html.
  3. Move the application name you want to be a default for html in the “Application Preference Order” to the top.

I copied this solution from here. Credits go to djhurio.

Categories: ubuntu Tags: , , ,

installing new fonts

Problem
You have a new font that you want to install system-wide. For instance, you copy some *.ttf fonts from a Windows machine (from C:\Windows\Fonts\) and you want to use them.

Solution
Install font-manager:

sudo apt-get install font-manager

With this software you can also browse your fonts. To install a new font, click on the Manage fonts icon in the bottom left corner next to the Save icon.

Tip from here.

Categories: ubuntu Tags: , ,

Remove Windows 8.1, then install Windows 7 and Ubuntu 14.04 in UEFI mode

Problem
I got a new desktop machine but it had Windows 8.1 preinstalled on it. What’s worse, it was a 32-bit version (on a 64-bit machine). I poked around a bit but I didn’t like it so I decided to put a good old Windows 7 on it with Ubuntu 14.04. It was afternoon…

Solution
It’s almost midnight and I got ready just a few minutes ago. Man, this UEFI thing made me suffer…

What I learned: if you install Windows 7 in UEFI mode, then install Ubuntu 14.04 in UEFI mode too! If you try to install Ubuntu in normal mode, you will have conflicts.

But what does it mean to start the installation in UEFI mode? It took me a while to figure out.

When you start the machine, you can press a button to enter the boot menu where you can select the device you want to boot from. In my case I got this info on my screen (green emphasis by me):

boot-menu

After pressing F11 (it may be a different button in your case), I got this screen:

boot-device

I had my Windows 7 on DVD and Ubuntu 14.04 on USB. Now, if you select option 1 (see the green numbers), then Windows 7 is started normally, while option 2 starts Windows 7 in UEFI mode. Similarly, option 3 starts Ubuntu normally, while option 4 starts it in UEFI mode. Once the installation is started, it cannot be changed later.

I had another problem. After several retries, I couldn’t install Windows 7. I got an error message that the selected disk is of GPT partition style. I found the fix for this problem here: http://www.youtube.com/watch?v=DQf9YqbD8WI. But be careful! This “fix” removes every partition from your hard drive. Do it only if you want to start with a clean sheet.

The fix above in short: when the screen with the “Start install” button appears, press Shift+F10 to open a terminal. Here start the command “diskpart”. Inside diskpart, run these commands:

list disk
select disk 0
clean

It will remove the GPT flag but it will also remove all the partitions!

Now, as I had a clean HDD, I installed Windows 7 first in UEFI mode (option 2 in the figure above).

After this I started the Ubuntu installation in UEFI mode too (option 4). This time I didn’t have any problem and I didn’t have to do any fancy settings with the disk partitioning. I created a swap partition and a root partition, then “start install”.

After a reboot I had a GRUB menu where I could start either Windows or Ubuntu.

Connecting PC and monitor via HDMI: “no signal”

Problem
At my workplace I got a new monitor (27″) that came with an HDMI cable. I connected the monitor and the PC but the monitor displayed a “No signal” error. I tried it with a VGA cable and it worked fine but the screen was not sharp enough. I had the impression that the lower quality was caused by the VGA cable. Hmm, how to make that HDMI connection work?

Solution
The solution is trivial. You need to select HDMI connection in the settings of your monitor, in the menu :) Really, that’s all. And the difference is clearly visible. Now my screen is sharp, much better than the VGA. So if you have HDMI connection, use it.

Categories: Uncategorized Tags: , ,

Online learning: extend your CV

June 24, 2014 1 comment
Categories: Uncategorized Tags: , ,

Stypi, a realtime editor

June 24, 2014 Leave a comment

Stypi is a realtime editor that allows multiple users to make changes to a single document at the same time. All you need to do is share the URL with others to begin collaborating!

This editor also supports programming languages that you can access by clicking on the “</>” button on the top left. For more information on how to use Stypi please click the FAQ link on the bottom left.” (source)

Categories: Uncategorized Tags: ,
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