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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