Linux环境 pip install PIL失败

环境：

Ubuntu 14.04

python 2.7.6

pip 1.5.4

问题1：

pip install PIL
Downloading/unpacking PIL
  Could not find any downloads that satisfy the requirement PIL
  Some externally hosted files were ignored (use --allow-external PIL to allow).
Cleaning up...
No distributions at all found for PIL
Storing debug log for failure in pip.log

解决方案：

pip install PIL --allow-external PIL --allow-unverified PIL

问题2：

error:could not create '/usr/local/lib/python2.7/dist-packages/PIL': Permission denied

解决方案：

sudo pip install PIL --allow-external PIL --allow-unverified PIL