Ubuntu :: This Computer Has Only 793.9 MB Disk Space Remaining?

My Lpatop has a 300G hard drive. It came, as many do pre-installed with a Window OS, in this case Vista 32-bit Home Prem. I had partitioned the hard drive to give a C drive of 97.7GB (Partition 2 /dev/sda 2/Host), a partition for applications and programs, D of 48.8GB (Partition 3 /dev/sda3) and a third partition, E for Documents, etc. of 148GB (Partition 5 /dev/sda 5 media/doc), which on scanning seems to be a sub set of a partition Partition 4 W95 Ext d LBA dev/sda 4.......There is another partition, Partition 1 /dev/sda1 and is called WinRE and is of 2.80GB.All are NTFS except for the Partition 4Windows works fine and I have no problems, but when I use Ubuntu I get errors on startup. In the first instance it will not install the latest Kernal and it gives a Battery Management error in GNOME. I get Storage warning messages all the time, which I believe is the cause of the problems. See enclosed.

I am assuming that the disk space issue is in Host and or Home. Other than all the operational data and applications I do NOT use the Ubuntu filing system, rather the Partition 5 which I created solely for this purpose, so it's not a case of deleting files, it is purely how Ubuntu created itself on install and its operational requirements.The problem is resulting in no space or ability to do updates and new installs, and Kernal and Gnome issues.