Hello, 

I am happend to use old hydro version and found problem. When they install `python-rosdep` , it requires `python-rosdistro (>= 0.7.0)` but hydro only support `python-rosdistro` of `0.6.9`.



```

root@1fbf52b0247d:~# apt-get install python-rosdep   

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Some packages could not be installed. This may mean that you have

requested an impossible situation or if you are using the unstable

distribution that some required packages have not yet been created

or been moved out of Incoming.

The following information may help to resolve the situation:



The following packages have unmet dependencies:

 python-rosdep : Depends: python-rosdistro (>= 0.7.0) but 0.6.9-100 is to be installed

E: Unable to correct problems, you have held broken packages.

```



Im not sure but just to update `python-rosdistro` of hydro to 0.6.9 to 0.7.0 may fail, because 0.7.0 require newer `dpkg`.





```

root@1fbf52b0247d:~# dpkg -i python-rosdistro_0.7.2-100_all.deb 

dpkg-deb: error: archive 'python-rosdistro_0.7.2-100_all.deb' contains not understood data member control.tar.xz, giving up

dpkg: error processing python-rosdistro_0.7.2-100_all.deb (--install):

 subprocess dpkg-deb --control returned error exit status 2

Errors were encountered while processing:

 python-rosdistro_0.7.2-100_all.deb

```











---

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