Project planning software for Linux

Question

I am looking for a project planning software for Linux which supports the following features:

• define a task A x days before or after a given task B
• if the date of task B changes also the date of A changes correspondingly
• show the date of task A
• provide a Gantt diagram

Nice to have:

• visualize the dependence between A and B
• export list dates of tasks as a list for printing

Answer 1

Try GanttProject

It simple, but look like it meet requirements.

I don't sure only about "timeline view" (Gantt diagram not it?) and "export list dates of tasks as a list for printing".

UPD

For example,

• make task B depend on A
• in B properties set delay (positive or negative) to shift start of task B relative to end of task A
• change start date for task A, and task B change dates automatically.

Or I misunderstood what's You mean by 1 and 2

UPD2