On Thu, 02 Aug 2018 16:56:01 +0900,
Imen Souidene wrote:
>  I restarted the pc:

Rebooting your system usually don't help.

Debugging your installation problem is a bit hard.
My recommendation is to prepare a clean new installation (it can be on
a virtual machine) of ubuntu (16.04 or newer) and install the things
there, then you can use it as a reference.

> imen@imen-HP-Pavilion-g6-Notebook-PC:~/ryu$ ryu-manager
> Traceback (most recent call last):

> pkg_resources.DistributionNotFound: The 'oslo.config>=2.5.0' distribution was 
> not found and is required by ryu

So you don't have oslo.config installed in the python2.7 tree.

>     On Thursday, August 2, 2018, 8:50:56 AM GMT+1, Imen Souidene via 
> Ryu-devel <ryu-devel@lists.sourceforge.net> wrote:  
>  
> imen@imen-HP-Pavilion-g6-Notebook-PC:~$ sudo pip install -U oslo.config
> The directory '/home/imen/.cache/pip/http' or its parent directory is not 
> owned by the current user and the cache has been disabled. Please check the 
> permissions and owner of that directory. If executing pip with sudo, you may 
> want sudo's -H flag.
> The directory '/home/imen/.cache/pip' or its parent directory is not owned by 
> the current user and caching wheels has been disabled. check the permissions 
> and owner of that directory. If executing pip with sudo, you may want sudo's 
> -H flag.
> Requirement already up-to-date: oslo.config in 
> /usr/local/lib/python3.6/site-packages (6.4.0)

Your pip is for python3.6.
Maybe you can use pip2.7 instead.
And there seems to be no python3.6 package for ubuntu 14.04.
Did you do some non-standard install operations on your system?

--
IWAMOTO Toshihiro

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