If you want to use desktop do the following:
- create a new dbms in desktop
- open the terminal for that dbms
- run bin/neo4j-admin import .. in that terminal
- start that dbms
- if you imported into a different than the default "neo4j" database, switch to the system db and run
create database mydb;
Alternatively you can use neo4j-admin dump on your db in /var/lib/neo4j and then import the dump file in desktop like shown above.
Just make sure your neo4j db in /var/lib is stopped when you use desktop