How do I insert an umlaut on the u in ubuntu?

I have already activated the compose key (left CTRL). According to all the forums I've read, I have to punch in Compose, followed by "u. This is what I get as a result: ´u'

I am really stuck here. Any help will be most appreciated.

UPDATED

I have worked it out.

Firstly, set your Compose Key to Right Alt (Alt Gr on my keyboard) so that it doesn't interfere with the short cuts for copy, paste and many other combinations.

then go to your document and

• press the Alt Gr button
• release it
• then type in u
• followed by "
• which gives you a ü

Hope this helps

Update For OS: Ubuntu 16.04 x86_64

Alternate characters (like umlauts) are inserted using multiple keystrokes in conjunction with the compose key. In ubuntu 16.04, compose key binding is turned off by default which can be enabled from

System settings-> Keyboard-> Shortcuts tab-> Typing column-> Compose Key

If the value in front of compose key is Disabled, click the value and Press the key to bind from the keyboard. In my case, compose key is set to AltGr key. Now you system to ready to print all german umlauts as below

compose key + " + A = Ä

compose key + " + O = Ö

compose key + " + U = Ü

compose key + " + ss = ß

compose key + ss = ß

Bam you go!

I know this question specifies 13.04 but thought I would add a solution for 18.04.

I found the default on my machine without making any changes in preferences was the following (I am using a UK keyboard):

Alt Gr + [ followed by the character to add the umlaut to (i.e u)

I did it using Ubuntu 15.10 with a UK keyboard and EN-GB keyboard. I don't know what a Compose key is so didn't intentionally use one. Instead the following keystrokes put umlauts over ü and ö.

• press the Shift+AltGr buttons
• release them
• then type in u or o
• followed by "
• which gives you a ü or ö.

Cheers