$ sudo apt-get update
$ sudo apt-get install libbackport-util-concurrent-ja

libbackport-util-concurrent-ja is installed in your system.

Make ensure the libbackport-util-concurrent-ja package were installed using the commands given below,

$ sudo dpkg-query -l | grep libbackport-util-concurrent-ja*

You will get with libbackport-util-concurrent-ja package name, version, architecture and description in a table

libbackport-util-concurrent-ja package basic information: