Is there a fine and easy software for Linux that allows a user to burn files on a CD multiple times i.e. allows users to create multi-session cds.
It is better if it is in the Ubuntu repo.
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The two major burning suites on Ubuntu definitely support multi-session:
Brasero is the "keep-it-simple" variant. It allows you to burn, copy and erase CD and DVD media: audio, video or data. Brasero supports a.o. on-the-fly burning, and offers multi-session support.
Brasero (source: Ubuntu Apps; click image for larger variant)
K3b is an alternative – maybe a little more complex, but also offers much more functionality. To get started, "beginners mode" makes it easier to use – while you can unleash its full powers in advanced mode.
K3b (source: Ubuntu Apps; click image for larger variant)
Choice is yours. Depending on the desktop variant of Ubuntu you have installed, one or both of them might be already available from the menus.