Sorry that I didn't provide everything that you asked for. Yes I am installing 
gt on newly installed Ubuntu17.10 and running `locate libpython`, among other 
things, gives me:

/var/lib/dpkg/info/libpython3-dev:amd64.list
/var/lib/dpkg/info/libpython3-dev:amd64.md5sums
/var/lib/dpkg/info/libpython3-stdlib:amd64.list
/var/lib/dpkg/info/libpython3-stdlib:amd64.md5sums
/var/lib/dpkg/info/libpython3.6-dev:amd64.list
/var/lib/dpkg/info/libpython3.6-dev:amd64.md5sums
/var/lib/dpkg/info/libpython3.6-minimal:amd64.conffiles
/var/lib/dpkg/info/libpython3.6-minimal:amd64.list
/var/lib/dpkg/info/libpython3.6-minimal:amd64.md5sums
/var/lib/dpkg/info/libpython3.6-minimal:amd64.postinst
/var/lib/dpkg/info/libpython3.6-minimal:amd64.postrm
/var/lib/dpkg/info/libpython3.6-minimal:amd64.prerm
/var/lib/dpkg/info/libpython3.6-stdlib:amd64.list
/var/lib/dpkg/info/libpython3.6-stdlib:amd64.md5sums
/var/lib/dpkg/info/libpython3.6-stdlib:amd64.prerm
/var/lib/dpkg/info/libpython3.6:amd64.list
/var/lib/dpkg/info/libpython3.6:amd64.md5sums
/var/lib/dpkg/info/libpython3.6:amd64.shlibs
/var/lib/dpkg/info/libpython3.6:amd64.symbols
/var/lib/dpkg/info/libpython3.6:amd64.triggers

Thus, the version 3.6 seems to be installed and I guess I need 3.5. Is that 
right?

Sent with [ProtonMail](https://protonmail.com) Secure Email.

-------- Original Message --------
On January 24, 2018 3:59 PM, Alexandre Hannud Abdo <[email protected]> wrote:

> Well, I'll ask again: are you installing on a new clean install of Ubuntu?
>
> Also, the package you're having trouble with is not Python, it's libpython. 
> Do you have libpython installed? What version? Did you try reinstalling it?
>
> If you don't provide us with detailed information, we can't do much to help 
> you.
>
> .~ยด
>
> On Wed, Jan 24, 2018 at 4:51 PM, Snehal Shekatkar 
> <[email protected]> wrote:
>
>> Unfortunately, installing Python3.5 didn't help me. Still throws the same 
>> error.
>>
>> Sent with [ProtonMail](https://protonmail.com) Secure Email.
>>
>> -------- Original Message --------
>> On January 24, 2018 11:48 AM, Alexandre Hannud Abdo <[email protected]> 
>> wrote:
>>
>>> Ni! Hi Snehal,
>>>
>>> Do you mean you tried this command on a new clean install of Ubuntu, 
>>> nothing else been done previously to it? - other than enabling he PPA and 
>>> updating the system, I'd guess.
>>>
>>> Otherwise, this may not be related to graph-tool at all, you just need to 
>>> figure out why libpython is not installable.
>>>
>>> (Did you already try any solution after searching the net for the error 
>>> message? For example, reinstalling python3 and the respective libpython? Or 
>>> calling install with aptitude instead of apt?)
>>>
>>> Cheers,
>>> .~'
>>>
>>> On Wednesday, January 24, 2018, Snehal Shekatkar 
>>> <[email protected]> wrote:
>>>
>>>> Dear Tiago,
>>>>
>>>> I am trying to install graph-tool on ubuntu17.10 and I get the following 
>>>> error:
>>>>
>>>> sudo apt-get install python3-graph-tool
>>>>
>>>> The following packages have unmet dependencies:
>>>> python3-graph-tool : Depends: libpython3.5 (>= 3.5.0~b1) but it is not 
>>>> installable
>>>> E: Unable to correct problems, you have held broken packages.
>>>>
>>>> How can I fix this?
>>>>
>>>> Thank you
>>>>
>>>> Snehal M. Shekatkar
>>>> Pune
>>>> India
>>>> www.snehalshekatkar.com
>>
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