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On ubuntu 18, you can install most ros dependencies from the apt repository using apt-get; it works well here and I do not get the errors you are reporting. apt-get knows to install the python2 files needed for melodic.

sudo apt-get install ros-melodic-sensor-msgs sudo apt-get install ros-melodic-tf2-sensor-msgs

On ubuntu 18, you can install most ros dependencies from the apt repository using apt-get; it works well here and I do not get the errors you are reporting. apt-get knows to install the python2 files needed for melodic.

``` sudo apt-get install ros-melodic-sensor-msgs ros-melodic-sensor-msgs

sudo apt-get install ros-melodic-tf2-sensor-msgs ```

On ubuntu 18, you can install most ros dependencies from the apt repository using apt-get; it works well here and I do not get the errors you are reporting. apt-get knows to install the python2 files needed for melodic.

```

sudo apt-get install ros-melodic-sensor-msgs

ros-melodic-sensor-msgs sudo apt-get install ros-melodic-tf2-sensor-msgs ```