As described by the linked Stackoverflow answer, run these commands:

sudo add-apt-repository ppa:git-core/ppa -y
sudo apt-get update
sudo apt-get install git
git --version

This will get you Git 2.6.4 (as of Dec 2015).

Troubleshooting

If you don't have add-apt-repository yet, install it with:

sudo apt-get install python-software-properties software-properties-common

sudo apt-get install sqlite3 libsqlite3-dev
sudo gem install sqlite3-ruby

• Run dconf-editor (as your user)
• Go to org / mate / panel / objects / clock / prefs
• Change the key format to custom
• Change the key custom-format to a strftime format string

A good, space-saving format string for German users is %d.%m. %H:%M. This shows the current date, month, hour and minute (e.g. 24.12. 23:59).

To create a 10 GB file:

fallocate -l 10G huge_file.dat

In /etc/rc.local add:

service bluetooth stop

Make sure you have libcurl3-dev installed:

sudo apt-get install libcurl3-dev
gem install typhoeus

Good article that tells you how to change behavior of certain keys via xmodmap (with the help of exv if you need to find out the keycode).

• Also works on Gnome 2
• Much prettier than Skype notifications
• Better visibility

uname -m

i686 means 32-bit.

To list the name and version of your Linux distribution, type the following:

cat /etc/*-release

I’m working on a problem for a client which involves connecting to a Microsoft SQL Server 2005 database from Linux using Ruby. Here’s what I did to get it working, based off some useful instructions that are tailored for Ruby on Rails:

When you write your next CarrierWave uploader, consider processing your images with libvips instead of ImageMagick.

Reasons for libvips

There are several upsides to using libvips over ImageMagick:

• libvips is considerably faster and uses less memory.
• ImageMagick has a large attack surface that has repeatedly caused security incidents in the past (compare [ImageMagick CVEs](https://www....

Note: Consider using MATE instead of Gnome 3 on newer system

Awesome is a very good tiling window manager that provides neat features like automatic layouting of windows, good multi-display support with per display workspaces and more. Unfortunately, it is only a window manager, and lacks a lot of Gnome's conveniences like the network manager, application menus, automatic updates etc.

Fortunately, Gnome allows you to selectively replace only the win...

When loading a database dump created with pg_dump into your database, you might run into an error like

pg_restore: error: unsupported version (1.15) in file header

This is because your local pg_restore version is too old to match the format created by pg_dump. The version of the PostgreSQL server doesn't matter here.

For example, the official Ubuntu 20.04 sources include only PostgreSQL 12, so your pg_restore version will also be v12. Ubuntu 22.04 includes version 14 in its sources.
Both seem to be incompatible with dumps ...

Navigation

CTRL + SHIFT + ALT + N

Search for any symbol in your application, like CSS classes, Ruby classes, methods, helpers etc.

CTRL + SHIFT + N

Search for filename in your application (also dependencies)

CTRL + E

Open a list of recently opened files

ALT + POS1

Open a the navigation bar as a context menu. Allows you to quickly navigate between files.

CTRL + G

Go to line

Actions

CTRL + SHIFT + A

:...

Here is a bash script that I use to auto-configure displays on Ubuntu 24.04 with Xorg.

Background

• Ubuntu always sets the primary display to the 1st (i.e. internal) display whenever I connect to a new Dock/Hub.
  • I want my primary display to be the large display.
  • My notebook is always placed left of external displays, so the 2nd display will be the center (or only) external display and should be primary.
• I also want all my displays to be placed horizontally, but bottom-aligned (the default would be aligned at their top edges)....

Although you can access many symbols using the AltGr key you may be missing some, like the en-dash (–) or em-dash (—). You can use a compose key for them instead.

First, make sure you have a compose key configured.

Configuring a compose key

I suggest using the "Menu" key which is located between the right Meta and Ctrl key.

Ubuntu / MATE

Control Center → Keyboard → Layout → Options → Position of Compos...

There are several tools for DNS debugging which offer you more or less information. Most of the time the more simple ones, like host oder nslookup will be sufficient.

host

simple DNS lookup utility.

>host heise.de
heise.de has address 193.99.144.80
heise.de has IPv6 address 2a02:2e0:3fe:1001:302::
heise.de mail is handled by 10 relay.heise.de.

nslookup

query Internet domain name servers. Nslookup has two modes: interactive and non-interactive.

>nslookup heise.de
Server:		146.254.160.30
Address:	146.254.160.3...

Orca is a Linux screen reader. Since it is part of the GNOME project it should come preinstalled with Ubuntu installations.
To turn on the screen reader you can either go to Settings > Accessibility and then activate Screen Reader in the "Seeing" section or you can simply type orca in your terminal.

Note

It may feel quite strange in the beginning to use a screen reader. It is constantly commenting on everything you do and every application you visit will be read aloud.

Once you started your screen reader you can simply navigate to w...