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as SystemV was replaced by upstart a while ago, the concept of runlevels is no longer valid on the last few Ubuntu versions (see also this issue at AskUbuntu.com).
– Izzy
Commented Jul 2, 2012 at 14:41
@Izzy Argh, I feel old now :<
– Darth Android
Commented Jul 2, 2012 at 15:31
@Darth_Android: Don't worry. Took me a while to get used to as well. To be honest: It took until a few days ago when I was trying to deactivate some unused services myself that I found out :D
– Izzy
Commented Jul 2, 2012 at 15:37
For me, I want to do it manually. So, I chose this first answer. Thank you all for other answers, too. In fact, I should do sudo stop lightdm. I can find the way by the keywords from your answers.
– 19 Lee
Commented Jul 2, 2012 at 16:43

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Correct minor typos or mistakes
Clarify meaning without changing it
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Always respect the author’s intent
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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)
<https://example.com>
[example](https://example.com)
<a href="https://example.com">example</a>

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