I installed Ubuntu 11.04 under Windows (using Wubi) and the default size for the "partition" was chosen as 10GB. Now it shows frequent issues due to low disk space. How can I increase the size of partition without reinstalling?
Alternatively, you can free up space in your Wubi image by moving some of your documents or other files like music, ebooks, or videos (just not programs or system files) to the host Windows system's partition (accessed as
/host in your Wubi system).
I don't think you can if it is a Wubi install.
However a remarkably easy and very effective fix (other than starting from scratch, making a new partition and installing Ubuntu there) is to follow the instructions and use the script in HOWTO: migrate wubi install to partition in Ubuntu forums.
I am a relative non-expert but I had this done in less than an hour (more like 30 mins) and it was perfect. It has the additional advantage that the Wubi (Windows) install remains intact just in case you have a problem with the migration and, of course, you will be able to change the new partition size if you need to later.