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Hi. python-roswtf
is the wrong package. Please uninstall it using sudo apt purge python-roswtf
. This is the correct package to install:
sudo apt install ros-melodic-roswtf
As a side note, if you want to install any ros packages via apt
, you can just search the ros wiki for a package (in this case, roswtf) and typically how you would install it is with the package name ros-DISTRIBUTION-PACKAGENAME
. In the case of roswtf, the package name on the ros wiki is roswtf
, and I assume you are using ros-melodic, so you can install it using the package name ros-melodic-roswtf
. If the package you are installing has an underscore in it, for example move_base, the package name to install via apt becomes ros-melodic-move-base
where the underscore in move_base has been replaced with a hyphen (move-base). This naming convention generally true for most packages on the ros wiki (but maybe not all packages).
Hope that helps.