SolverProblemError when trying to add tensorflow with poetry 0.10.2

I bumped into a problem today. Not sure what’s causing it, but I can reproduce it in a blank project:

munshkr@munshkr-x260:~$ poetry new bla
Created package bla in bla
munshkr@munshkr-x260:~$ cd bla/
munshkr@munshkr-x260:~/bla$ poetry add tensorflow
Creating virtualenv bla-py3.6 in /home/munshkr/.cache/pypoetry/virtualenvs
Using version ^1.8 for tensorflow

Updating dependencies
Resolving dependencies... (0.0s)
                                                                                               
[SolverProblemError]                                                            
Because no versions of tensorflow match >1.8,<2.0                                            
 and tensorflow (1.8.0) depends on tensorboard (>=1.8.0,<1.9.0), tensorflow (>=1.8,<2.0) re  
quires tensorboard (>=1.8.0,<1.9.0).                                                         
Because tensorboard (1.8.0) requires Python >= 2.7, != 3.0.*, != 3.1.*                       
 and no versions of tensorboard match >1.8.0,<1.9.0, tensorboard is forbidden.               
Thus, tensorflow is forbidden.                                                               
So, because bla depends on tensorflow (^1.8), version solving failed.    

Running the same command with -vvv shows the following:

PyPI: 37 packages found for tensorflow *
Using version ^1.8 for tensorflow

Updating dependencies
Resolving dependencies...
   1: fact: foo is 0.1.0
   1: derived: foo
   1: fact: foo depends on tensorflow (^1.8)
   1: fact: foo depends on pytest (^3.0)
   1: selecting foo (0.1.0)
   1: derived: pytest (^3.0)
   1: derived: tensorflow (^1.8)
PyPI: 27 packages found for pytest >=3.0,<4.0
PyPI: 1 packages found for tensorflow >=1.8,<2.0
   1: fact: tensorflow (1.8.0) depends on wheel (>=0.26)
   1: fact: tensorflow (1.8.0) depends on grpcio (>=1.8.6)
   1: fact: tensorflow (1.8.0) depends on termcolor (>=1.1.0)
   1: fact: tensorflow (1.8.0) depends on tensorboard (>=1.8.0,<1.9.0)
   1: fact: tensorflow (1.8.0) depends on protobuf (>=3.4.0)
   1: fact: tensorflow (1.8.0) depends on six (>=1.10.0)
   1: fact: tensorflow (1.8.0) depends on numpy (>=1.13.3)
   1: fact: tensorflow (1.8.0) depends on gast (>=0.2.0)
   1: fact: tensorflow (1.8.0) depends on astor (>=0.6.0)
   1: fact: tensorflow (1.8.0) depends on absl-py (>=0.1.6)
   1: selecting tensorflow (1.8.0)
   1: derived: absl-py (>=0.1.6)
   1: derived: astor (>=0.6.0)
   1: derived: gast (>=0.2.0)
   1: derived: numpy (>=1.13.3)
   1: derived: six (>=1.10.0)
   1: derived: protobuf (>=3.4.0)
   1: derived: tensorboard (>=1.8.0,<1.9.0)
   1: derived: termcolor (>=1.1.0)
   1: derived: grpcio (>=1.8.6)
   1: derived: wheel (>=0.26)
PyPI: No release information found for absl-py-0.0, skipping
PyPI: 11 packages found for absl-py >=0.1.6
PyPI: 3 packages found for astor >=0.6.0
PyPI: 1 packages found for gast >=0.2.0
PyPI: No release information found for numpy-0.9.6, skipping
PyPI: No release information found for numpy-0.9.8, skipping
PyPI: No release information found for numpy-1.0.3, skipping
PyPI: No release information found for numpy-1.0.4, skipping
PyPI: No release information found for numpy-1.0b1, skipping
PyPI: No release information found for numpy-1.0b4, skipping
PyPI: No release information found for numpy-1.0b5, skipping
PyPI: No release information found for numpy-1.0rc1, skipping
PyPI: No release information found for numpy-1.0rc2, skipping
PyPI: No release information found for numpy-1.0rc3, skipping
PyPI: No release information found for numpy-1.1.1, skipping
PyPI: No release information found for numpy-1.2.0, skipping
PyPI: No release information found for numpy-1.2.1, skipping
PyPI: No release information found for numpy-1.4.0, skipping
PyPI: 6 packages found for numpy >=1.13.3
PyPI: 2 packages found for six >=1.10.0
PyPI: 5 packages found for protobuf >=3.4.0
PyPI: 1 packages found for tensorboard >=1.8.0,<1.9.0
PyPI: 1 packages found for termcolor >=1.1.0
PyPI: No release information found for grpcio-0.12.0b8, skipping
PyPI: No release information found for grpcio-0.3.0, skipping
PyPI: No release information found for grpcio-0.4.0, skipping
PyPI: 19 packages found for grpcio >=1.8.6
PyPI: 8 packages found for wheel >=0.26
   1: selecting gast (0.2.0)
   1: fact: tensorboard (1.8.0) requires Python >= 2.7, != 3.0.*, != 3.1.*
   1: derived: not tensorboard (1.8.0)
PyPI: 0 packages found for tensorboard >1.8.0,<1.9.0
   1: fact: no versions of tensorboard match >1.8.0,<1.9.0
   1: conflict: no versions of tensorboard match >1.8.0,<1.9.0
   1: derived: not tensorboard (>1.8.0,<1.9.0)
   1: conflict: tensorboard (1.8.0) requires Python >= 2.7, != 3.0.*, != 3.1.*
   1: ! tensorboard (1.8.0) is partially satisfied by not tensorboard (>1.8.0,<1.9.0)
   1: ! which is caused by "no versions of tensorboard match >1.8.0,<1.9.0"
   1: ! thus: tensorboard is forbidden
   1: fact: tensorboard is forbidden
   1: derived: not tensorboard (>=1.8.0,<1.9.0)
   1: derived: not tensorflow (1.8.0)
PyPI: 0 packages found for tensorflow >1.8,<2.0
   1: fact: no versions of tensorflow match >1.8,<2.0
   1: conflict: no versions of tensorflow match >1.8,<2.0
   1: ! tensorflow (>1.8,<2.0) is partially satisfied by not tensorflow (1.8.0)
   1: ! which is caused by "tensorflow (1.8.0) depends on tensorboard (>=1.8.0,<1.9.0)"
   1: ! thus: tensorflow (>=1.8,<2.0) requires tensorboard (>=1.8.0,<1.9.0)
   1: ! not tensorboard (>=1.8.0,<1.9.0) is satisfied by not tensorboard (>=1.8.0,<1.9.0)
   1: ! which is caused by "tensorboard is forbidden"
   1: ! thus: tensorflow is forbidden
   1: ! tensorflow (>=1.8,<2.0) is satisfied by tensorflow (^1.8)
   1: ! which is caused by "foo depends on tensorflow (^1.8)"
   1: ! thus: version solving failed
   1: Version solving took 0.097 seconds.
   1: Tried 1 solutions.

...

I tried deleting the .cache/pypoetry directory but the error keeps ocurring. Poetry version is 0.10.2 (installed via pip)

[sdispater]

This should be fixed in the latest release (0.10.3)

[Yevgnen]

Encounter the same problem using poetry 1.0.0 when install tensorboard.

douban: 0 packages found for tensorboard >=2.1.0,<3.0.0
thu: 0 packages found for tensorboard >=2.1.0,<3.0.0
ustc: 0 packages found for tensorboard >=2.1.0,<3.0.0
   1: fact: no versions of tensorboard match >=2.1.0,<3.0.0
   1: conflict: no versions of tensorboard match >=2.1.0,<3.0.0
   1: ! tensorboard (^2.1.0) is satisfied by tensorboard (^2.1.0)
   1: ! which is caused by "env depends on tensorboard (^2.1.0)"
   1: ! thus: version solving failed
   1: Version solving took 3.362 seconds.
   1: Tried 1 solutions.

I found that poetry may find or not find some packages during multiple runs when the same toml while I can install the package from any of the indexes. If I run poetry update again, it may fail. And some runs after, it may work again and find the package.