$ sudo apt-get update
$ sudo apt-get install libonline-accounts-client1 

libonline-accounts-client1 is installed in your system.

Make ensure the libonline-accounts-client1 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libonline-accounts-client1 *

You will get with libonline-accounts-client1 package name, version, architecture and description in a table

libonline-accounts-client1 package basic information: