conda install failed on Ubuntu 16.04

[PaPeK]

Hi there,

I just newly set up anacondad3 and additionally only installed nbextensions. After calling: conda install xeus-cling xplot -c QuantStack -c conda-forge

The error message is:

Solving environment: failed

UnsatisfiableError: The following specifications were found to be in conflict:
  - defaults/linux-64::zeromq==4.2.5=h439df22_0
  - xeus-cling
Use "conda info <package>" to see the dependencies for each package.

I would really love to use cling-xeus!

[SylvainCorlay]

This is a bug in the conda solver that we just came across yesterday!

If you aff "zeromq" with no version spec in the install command, it should install things properly!

[SylvainCorlay]

We are working with upstream to fix this.

[PaPeK]

Hi There,

I did the following to get it done:

>>conda update zeromq
Solving environment: done

## Package Plan ##

  environment location: /home/klamser/anaconda3

  added / updated specs: 
    - zeromq

The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    conda-4.5.9                |           py36_0         1.0 MB

The following packages will be UPDATED:

    conda: 4.5.4-py36_0 --> 4.5.9-py36_0

Proceed ([y]/n)? y

Downloading and Extracting Packages
conda-4.5.9          |  1.0 MB | ####################################### | 100% 
Preparing transaction: done
Verifying transaction: done
Executing transaction: done

which uploaded and updated conda..... dont know why. After that I could succesfully run the installation. Maybe it helps you which up- and downgrades it did:

Solving environment: done

## Package Plan ##

  environment location: /home/klamser/anaconda3

  added / updated specs: 
    - xeus-cling
    - xplot

The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    libcxx-5.0.0               |                0         1.2 MB  conda-forge
    cling-patches-1            |                0           2 KB  QuantStack
    xplot-0.8.0                |                0         1.4 MB  QuantStack
    nlohmann_json-3.1.2        |                0          88 KB  QuantStack
    openssl-1.0.2o             |       h470a237_1         3.5 MB  conda-forge
    llvmdev-5.0.0              |          cling_1       132.6 MB  QuantStack
    cryptopp-5.6.5             |          cling_0         1.7 MB  QuantStack
    util-linux-2.21            |                0          35 KB
    cling-0.5                  |                7        22.3 MB  QuantStack
    ca-certificates-2018.4.16  |                0         139 KB  conda-forge
    zeromq-4.2.3               |          cling_3         910 KB  QuantStack
    libiconv-1.15              |       h470a237_2         2.0 MB  conda-forge
    conda-4.5.9                |           py36_0         625 KB  conda-forge
    xproperty-0.7.0            |                0          10 KB  QuantStack
    isl-0.17.1                 |                1         1.6 MB  conda-forge
    cppzmq-4.2.3               |          cling_0          15 KB  QuantStack
    system-5.8                 |                2         170 KB
    clangdev-5.0.0             |          cling_1        87.3 MB  QuantStack
    gcc-7-7.2.0                |                1        55.9 MB  QuantStack
    xwidgets-0.12.2            |                0         1.2 MB  QuantStack
    xeus-0.13.0                |          cling_0         670 KB  QuantStack
    xeus-cling-0.4.5           |                0        17.8 MB  QuantStack
    certifi-2018.4.16          |           py36_0         142 KB  conda-forge
    xtl-0.4.13                 |                0          47 KB  QuantStack
    pyzmq-17.0.0               |          cling_0         1.1 MB  QuantStack
    libgcc-7-7.2.0             |                0         834 KB  QuantStack
    ------------------------------------------------------------
                                           Total:       333.0 MB

The following NEW packages will be INSTALLED:

    clangdev:        5.0.0-cling_1         QuantStack  [cling]
    cling:           0.5-7                 QuantStack  [cling]
    cling-patches:   1-0                   QuantStack 
    cppzmq:          4.2.3-cling_0         QuantStack  [cling]
    cryptopp:        5.6.5-cling_0         QuantStack  [cling]
    gcc-7:           7.2.0-1               QuantStack 
    isl:             0.17.1-1              conda-forge
    libcxx:          5.0.0-0               conda-forge
    libgcc-7:        7.2.0-0               QuantStack 
    libiconv:        1.15-h470a237_2       conda-forge
    llvmdev:         5.0.0-cling_1         QuantStack  [cling]
    nlohmann_json:   3.1.2-0               QuantStack 
    system:          5.8-2                            
    util-linux:      2.21-0                           
    xeus:            0.13.0-cling_0        QuantStack  [cling]
    xeus-cling:      0.4.5-0               QuantStack 
    xplot:           0.8.0-0               QuantStack 
    xproperty:       0.7.0-0               QuantStack 
    xtl:             0.4.13-0              QuantStack 
    xwidgets:        0.12.2-0              QuantStack 

The following packages will be REMOVED:

    anaconda:        5.2.0-py36_3                     

The following packages will be UPDATED:

    ca-certificates: 2018.03.07-0                      --> 2018.4.16-0       conda-forge
    certifi:         2018.4.16-py36_0                  --> 2018.4.16-py36_0  conda-forge
    conda:           4.5.9-py36_0                      --> 4.5.9-py36_0      conda-forge
    openssl:         1.0.2o-h20670df_0                 --> 1.0.2o-h470a237_1 conda-forge
    pyzmq:           17.0.0-py36h14c3975_0             --> 17.0.0-cling_0    QuantStack  [cling]

The following packages will be DOWNGRADED:

    zeromq:          4.2.5-h439df22_0                  --> 4.2.3-cling_3     QuantStack  [cling]

Proceed ([y]/n)? y