之前安装的ROS是Fuerte版本的，好久没有更新，不知不觉又出来了好几个新的版本，今天删除了Fuerte，计划安装Hydro版本的尝尝新，按照官网的安装流程，很快就可以把新版本安装上去了，但是在“rosdep update”这一步却总是报错：
reading in sources list data from /etc/ros/rosdep/sources.list.d
Hit https://github.com/ros/rosdistro/raw/master/rosdep/osx-homebrew.yaml
Hit https://github.com/ros/rosdistro/raw/master/rosdep/base.yaml
Hit https://github.com/ros/rosdistro/raw/master/rosdep/python.yaml
Hit https://github.com/ros/rosdistro/raw/master/rosdep/ruby.yaml
Hit https://github.com/ros/rosdistro/raw/master/releases/fuerte.yaml
Query rosdistro index https://raw.github.com/ros/rosdistro/master/index.yaml
ERROR: Rosdep experienced an error: Unable to handle 'index' format version '2', please update rosdistro
Please go to the rosdep page [1] and file a bug report with the stack trace below.
[1] : http://www.ros.org/wiki/rosdep
rosdep version: 0.10.25
Traceback (most recent call last):
File "/usr/lib/pymodules/python2.7/rosdep2/main.py", line 121, in rosdep_main
exit_code = _rosdep_main(args)
File "/usr/lib/pymodules/python2.7/rosdep2/main.py", line 264, in _rosdep_main
return _no_args_handler(command, parser, options, args)
File "/usr/lib/pymodules/python2.7/rosdep2/main.py", line 272, in _no_args_handler
return command_handlers[command](options)
File "/usr/lib/pymodules/python2.7/rosdep2/main.py", line 437, in command_update
error_handler=update_error_handler)
File "/usr/lib/pymodules/python2.7/rosdep2/sources_list.py", line 433, in update_sources_list
for d, dist in get_index().distributions.items():
File "/usr/lib/pymodules/python2.7/rosdep2/rosdistrohelper.py", line 69, in get_index
_RDCache.index = rosdistro.get_index(_RDCache.index_url)
File "/usr/local/lib/python2.7/dist-packages/rosdistro/__init__.py", line 106, in get_index
return Index(data, base_url)
File "/usr/local/lib/python2.7/dist-packages/rosdistro/index.py", line 51, in __init__
assert int(data['version']) == 1, "Unable to handle '%s' format version '%d', please update rosdistro" % (Index._type, int(data['version']))
AssertionError: Unable to handle 'index' format version '2', please update rosdistro
从网上搜索了错误信息，在论坛里有一种解决办法，见：http://answers.ros.org/question/122266/how-can-i-fix-unable-to-handle-index-format-version-2-please-update-rosdistro/
根据网上找到的办法，rosdistro无法更新，依然解决不了问题，所以考虑可不可以直接通过编译好的包来安装rosdistro，从网上找到0.3.4版本，见https://pypi.python.org/pypi/rosdistro
下载压缩包，解压，进入目录，输入“ sudo python setup.py install ”， 再重新尝试“rosdep update”，问题解决，不会再报error。
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