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Sometimes you need to know, which Linux distro you are running, and especially, which version:

lsb_release -a

The answer will look like:

No LSB modules are available
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty

your hd is full, make space in /boot aaaa make a

cd /boot ls -la
so you see the `/boot` folder

now delete the stuff you don’t need anymore:

sudo aptitude remove linux-image-3.13.0-49-generic
sudo apt-get remove ...

(ls -la after deleting the linux kernel image)

If you have on a server a folder which is to big, and you want to know, which file is the reason for a problem, use du

du -m | sort -n | tail -n 10

for finding the 10 biggest folders.
(repeat this step in the biggest folder again to find the “problem folders”)

If the nodejs server was installed via the package manager, it is not in:
/usr/bin/env/node,
it is in:
/usr/bin/env/nodejs

To solve this problem, you should set a symlink

ln -s /usr/bin/nodejs /usr/bin/node

credits for this hint: digitalmediums at github

If you have more than one Skype account (to seperate private and business) and you want to use them simultaneous, you have to:

press ALT + F2

enter: skype --secondary

Credits: gvscroder at skype forum