letsencrypt not installable

[Torsten Crass <tc@aldebaran.de>]

Hi there,

it seems letsencrypt is not installable on an up-to-date Jessie system:

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apt-get install -t jessie-backports letsencrypt
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:
 letsencrypt : Depends: python-letsencrypt (= 0.5.0-1~bpo8+1) but it is 
not going to be installed
E: Unable to correct problems, you have held broken packages.
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Aptitude is a little bit more verbose and explains:

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aptitude install -t jessie-backports letsencrypt
The following NEW packages will be installed:
  dialog{a} letsencrypt python-acme{ab} python-cffi-backend{a} 
python-chardet{a}
  python-configargparse{a} python-configobj{a} python-cryptography{a} 
python-dialog{a}
  python-enum34{a} python-funcsigs{a} python-idna{a} 
python-ipaddress{a} python-letsencrypt{a}
  python-mock{a} python-ndg-httpsclient{a} python-openssl{a} 
python-parsedatetime{a}
  python-pbr{a} python-pkg-resources{a} python-psutil{a} 
python-pyasn1{a} python-pyicu{a}
  python-requests{a} python-rfc3339{a} python-six{a} python-tz{a} 
python-urllib3{a}
  python-zope.component{a} python-zope.event{a} python-zope.interface{a}
0 packages upgraded, 31 newly installed, 0 to remove and 20 not upgraded.
Need to get 2,074 kB of archives. After unpacking 11.2 MB will be used.
The following packages have unmet dependencies:
 python-acme : Breaks: python-letsencrypt (< 0.6.0) but 0.5.0-1~bpo8+1 
is to be installed.
The following actions will resolve these dependencies:

     Keep the following packages at their current version:
1)     letsencrypt [Not Installed]
2)     python-letsencrypt [Not Installed]



Accept this solution? [Y/n/q/?] n

*** No more solutions available ***

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Any hope this might get fixed in the near future?

Cheers --

	Torsten