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python-rospkg 1.1.4-1 is from upstream Ubuntu while python-rospkg-modules 1.1.10-1 is from packages.ros.org which conflicts with the Ubuntu version. Make sure that you have not pinned that version of python-rospkg or otherwise forced the version dependency resolution or prevented the upgrade.

Conflict is explicitly stated and should be triggered when trying to install via apt

$ apt-cache show python-rospkg-modules
Package: python-rospkg-modules
Priority: optional
Section: python
Installed-Size: 130
Maintainer: Ken Conley <kwc@willowgarage.com>
Architecture: all
Version: 1.1.10-1
Replaces: python-rospkg (<< 1.1.0)
Depends: python-yaml, python:any (<< 2.8), python:any (>= 2.7.5-5~), python-catkin-pkg-modules, lsb-release
Conflicts: python-rospkg (<< 1.1.0)
Filename: pool/main/p/python-rospkg-modules/python-rospkg-modules_1.1.10-1_all.deb
SHA512: 07a5c3fbd0d9e64d14e551afc0776624f988d901f2515394d25d22c39a0036a772855548c60253ecd70be093928ea63f4de2f83d9d95590db6825c52d7453aa5
Size: 23728
SHA256: 566648a492245638a0ccbd56140fec74504a820849c062f6fc5a0018ced5e52b
SHA1: 8ec5d1b6acd8ede75949c24695511878ce356e6d
MD5sum: a1122b3d214bd3869359d5da92542b03
Description: ROS package library
         Library for retrieving information about ROS packages and stacks.
Description-md5: 1f0f66a0136715f5b0d845083b68d081
Homepage: http://wiki.ros.org/rospkg

Modules source

$ apt-cache policy python-rospkg-modules
python-rospkg-modules:
  Installed: 1.1.10-1
  Candidate: 1.1.10-1
  Version table:
 *** 1.1.10-1 500
        500 http://packages.ros.org/ros/ubuntu bionic/main amd64 Packages
        500 http://packages.ros.org/ros/ubuntu bionic/main i386 Packages
        500 http://packages.ros.org/ros2/ubuntu bionic/main amd64 Packages
        500 http://packages.ros.org/ros2/ubuntu bionic/main arm64 Packages
        100 /var/lib/dpkg/status

Executable sources

$ apt-cache policy python-rospkg
python-rospkg:
  Installed: 1.1.10-100
  Candidate: 1.1.10-100
  Version table:
 *** 1.1.10-100 500
        500 http://packages.ros.org/ros/ubuntu bionic/main amd64 Packages
        500 http://packages.ros.org/ros/ubuntu bionic/main i386 Packages
        500 http://packages.ros.org/ros2/ubuntu bionic/main amd64 Packages
        500 http://packages.ros.org/ros2/ubuntu bionic/main arm64 Packages
        100 /var/lib/dpkg/status
     1.1.4-1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe i386 Packages