Restore a SQL Server bacpac file in Linux
I'd recommend trying the restore process suggested in the Microsoft Docs - https://docs.microsoft.com/en-us/sql/linux/sql-server-linux-migrate-sqlpackage

It looks like this may help:

RESTORE DATABASE AdventureWorks
FROM DISK = '/var/opt/mssql/backup/AdventureWorks2014.bak'
WITH MOVE 'AdventureWorks2014_Data' TO '/var/opt/mssql/data/AdventureWorks2014_Data.mdf',
MOVE 'AdventureWorks2014_Log' TO '/var/opt/mssql/data/AdventureWorks2014_Log.ldf'
GO


Hope this helps with the path issue you're running into.