If you want to make dual-boot between OS X and Ubuntu, then you should install OS X first.
FYI, Mac use EFI Boot which you need third party as boot loader. I remind you that GRUB doesn't works here.
Go to http://refit.sourceforge.net and install from your OS X. Make reboot twice and you will see Refit loader at boot startup.

Default java instalation Ubuntu in Amazon EC2 AMI is using java-1.6.0-openjdk. When you using SOLR, Tomcat 6 and Glassfish, sometimes you meet condition that need FULL of Sun java 6 JDK + JRE. So, i think, it's will be good point if we remove default Java instalation in Ubuntu 10.10 and using Sun Java 6 for investment. So, here are steps for removing it :

I remove my Mac OS X and will use Ubuntu as entirely system in my Macbook Pro. This is because Mac was open source it's system and driver, also there is Ubuntu ISO bundle with Mac driver which will make all my hardware works 100%. I'm doing this into my Macbook Pro 7,1. Here are the steps.

Today, i have error "Fatal error: Call to undefined method PEAR::raiseErro() in /usr/share/php/PEAR/REST.php on line 165" when do pecl install apc, mongo, memcached and memcache. I'm using Ubuntu 10.04. After searching for a while, then i got solution to fix this problem by single command line :

Actually, this is some bug in Ubuntu 10.04.

Configuring Magic Mouse in Ubuntu with Bluetooth is pretty hard because lack of documentation. If you want to connect and enable your Magic Mouse Apple in Ubuntu, use this steps :

1. Removing magic mouse device from bluetooth if detected
2. We need install some bluetooth package sudo apt-get install bluez-compat
3. Off and On your Magic Mouse Wireless
4. Scan by sudo hcitool scan

When installing Ubuntu 10.10 in Macbook Pro (7,1), you will facing several issue. Here are list the problem and solution :

1. Sound card doesn't works
To fixing this problem, you will do 2 steps :
A. Edit /etc/modprobe.d/alsa-base.conf and put options snd-hda-intel model=mbp55 at end of line.
B. Type alsamixer in command and UN-MUTE front speaker by type M.

2. Keyboard backlight Macbook Pro doesn't works
To fixing this problem, you need to remove mouseemu by sudo aptitude remove mouseemu

Today, i totally remove MacOSX from my Macbook PRO. Why? because it suck developing under Mac OS X which it's a heaven for designer. First, i backup all my data and formating my Mac. But, if you want to do same way like me, considering this point that you will get after migrate between Mac into Ubuntu. This negative point when you moving into Ubuntu with your Mac.

Sometimes we exporting all-databases.sql from mysqldump which it's overiding our root password. We can recover root password by this several steps :

1. Stop MySQL service by : sudo service mysql stop

2. Using mysqld_safe : sudo mysqld_safe --skip-grant-tables &

3. Login to mysql : mysql -u root and do this steps :

A.use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed

Installing APC in Ubuntu 10.10 is easy because it's already in universe package. Running Drupal 7 without APC like you run without shoes. It's will enable all the power of Drupal 7. So, here are steps for installing APC :

1. sudo apt-get install apache2-threaded-dev build-essential php5-dev php-pear

2. sudo pecl install apc

3. Add extension=apc.so in /etc/php5/apache2/php.ini.

Another APC configuration :

This is complete guide instalation EC2 Large Ubuntu 10.10 Maverick. I assumed you install Community AMI Ubuntu Final ( no testing , no milestone and no daily ) 64 bit.

1. Configure Security Groups for allowing access.
DNS (TCP & UDP) on port 53, SSH on port 22

2. Login into server using SSH. Upgrade server by : sudo apt-get update and sudo apt-get upgrade