本人用的ubuntu12.0.4 64位，之前安装skype4.3一直都能正常使用，安装方法如下：
1. 把下述兩行加入 /etc/apt/sources.list
1-1. ubuntu 14.04
deb http://archive.canonical.com/ubuntu trusty partner
deb-src http://archive.canonical.com/ubuntu trusty partner
1-2. ubuntu 12.04
deb http://archive.canonical.com/ubuntu precise partner
deb-src http://archive.canonical.com/ubuntu precise partner
2. sudo apt-get update
3. sudo apt-get upgrade # 選項 可作 可不作
4. sudo apt-get install skype
但是当我把自己设为管理员权限之后，skype登陆不上，提示错误：加载数据库失败，可能有一客户端在使用。
查找半天，stackoverflow上的解决办法：
step 1: remove the old version of skype (4.2 or older)
cd ~ && rm -r .skype sudo apt-get remove skype skype-bin:i386 skype:i386sudo apt-get install sni-qt:i386
step 2: install skype version 4.3
for 32-bit operating systems: follow these steps
sudo apt-get updatesudo apt-get install gdebiwget download.skype.com/linux/skype-ubuntu-precise_4.3.0.37-1_i386.debsudo gdebi skype-ubuntu-precise_4.3.0.37-1_i386.deb
for 64-bit operating systems: follow these steps
sudo dpkg --add-architecture i386sudo apt-get updatesudo apt-get install gdebiwget download.skype.com/linux/skype-ubuntu-precise_4.3.0.37-1_i386.debsudo gdebi skype-ubuntu-precise_4.3.0.37-1_i386.deb