In Gimp you go to Image in the top menu bar and select Mode followed by Indexed. Now you see a popup where you can select the number of colors for a generated optimum palette.
You’ll have to experiment a little because it will depend on your image.
I used this approach to shrink the size of the cover image in the_zopfli post from a 37KB (JPG) to just 15KB (PNG, all PNG sizes listed include Zopfli compression btw).
A clear difference between Debian/Ubuntu and for example Red Hat/Fedora is that packages which include system services will enable and start those services at install time in Debian/Ubuntu whereas they will not start automatically in Red Hat/Fedora.
Sometimes it would be very convenient if the service would not start automatically, for example if you need to configure the service before starting it for the first time.
To prevent the automatic start of system services at install time in Debian, just set the RUNLEVEL environment variable like so:
Having an encrypted hard drive is all well and good, but chances are that if someone is gonna steal your laptop, it’s probably not going to be turned off. Most likely, it will be stolen in a powered-on state. And so your encrypted hard drive doesn’t increase your security at all since it’s currently unlocked.
In my mind, it’s a slight improvement if the computer somehow can shutdown if someone is trying to gain access to it.
Update 2016-11-22: Made the Makefile compatible with BSD sed (MacOS)
One advantage that static sites, such as those built by Hugo, provide is fast loading times. Because there is no processing to be done, no server side rendering, no database lookups, loading times are just as fast as you can serve the files that make up the page. This means that bandwidth becomes the primary bottleneck, which incidentally is one of the factors used by Google to calculate your search ranking.
So I recently migrated this site from Ghost to Hugo after reading a nice article about the Hugo in Linux Voice #20 (funnily enough, the same issue also features an article about Ghost). I originally made the switch to Ghost from Jekyll back in 2014 or so mainly because I could not find a good theme to use. Ghost also seemed to have a lot of cool features and it’s fun to try new things.