Is there any software similar to PowerDesigner for Ubuntu 10?

Yes, there are several alternatives to PowerDesigner that can run on Ubuntu 10. Some popular options include Dia, which is a diagramming tool, and ArgoUML, a UML modeling tool. Additionally, tools like Modelio and StarUML may also meet your needs for data modeling and design. Be sure to check compatibility with Ubuntu 10, as some software may require newer versions of dependencies.