准备工作：
1、更换阿里源，参见Seafile部署--官方一键安装脚本
2、apt update更新下，顺带测试阿里源
第一步
#按官方说明安装各种包
apt-get install python2.7 libpython2.7 python-setuptools python-imaging python-ldap python-urllib3 ffmpeg python-pip python-mysqldb python-memcache
第二步
#pip更换阿里源
pip install -i https://mirrors.aliyun.com/pypi/simple pip -U
pip config set global.index-url https://mirrors.aliyun.com/pypi/simple
记录第一个坑
#第一次使用的不是https地址，结果报错
pip config set global.index-url http://mirrors.aliyun.com/pypi/simple
ERROR: unknown command "config"
#更换https地址，结果又报错
pip config set global.index-url https://mirrors.aliyun.com/pypi/simple
Traceback (most recent call last):
File "/usr/bin/pip", line 9, in
from pip import main
ImportError: cannot import name main
解决方法
vi /usr/bin/pip
#然后修改from pip import main为from pip._internal import main
第三步
pip install pillow moviepy
发现报错，遇到第二个坑，如下
#报错一
Ignoring imageio: markers 'python_version >= "3.4"' don't match your environment '
Ignoring imageio-ffmpeg: markers 'python_version >= "3.4"' don't match your environment '
#报错二
Collecting numpy (from moviepy)
Downloading https://mirrors.aliyun.com/pypi/packages/ac/36/325b27ef698684c38b1fe2e546e2e7ef9cecd7037bcdb35c87efec4356af/numpy-1.17.2.zip (6.5MB)
|████████████████████████████████| 6.5MB 2.2MB/s
ERROR: Command errored out with exit status 1:
command: /usr/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-BKYrs4/numpy/setup.py'"'"'; __file__='"'"'/tmp/pip-install-BKYrs4/numpy/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base pip-egg-info
cwd: /tmp/pip-install-BKYrs4/numpy/
Complete output (5 lines):
Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-install-BKYrs4/numpy/setup.py", line 31, in
raise RuntimeError("Python version >= 3.5 required.")
RuntimeError: Python version >= 3.5 required.
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
先解决第二个，发现python最高只支持numpy1.16，因此安装如下：
pip install numpy==1.16
pip install MoviePy重新安装MoviePy，pip list发现imageio和moviepy都在了，剩下imageio-ffmpeg
Package Version
---------------- ---------
......
imageio 2.4.1
moviepy 1.0.1
......
MoviePy官方提示需要安装依赖包ez_setup
pip install ez_setup`
pip install MoviePy
发现imageio-ffmpeg安装成功，但是出现另个报报错
ERROR: moviepy 1.0.1 has requirement imageio<3.0,>=2.5, but you’ll have imageio 2.4.1 which is incompatible.
然后升级imageio到2.5.0，然后又报错
ERROR: moviepy 1.0.1 has requirement imageio<2.5,>=2.0, but you’ll have imageio 2.5.0 which is incompatible.
偶滴乖乖，这是什么鬼
最后
无视报错，先检查数据库是否正常安装，然后直接运行安装包中setup-seafile-mysql.sh，安装正常，系统登录正常。
总结
系统和应用总是在不断变化，需要注意各个应用之间版本的依赖关系。