I need help to shuffle some partition space

[GranPaSmurf]

my dropbox keeps telling me that it can't sync because there is not enough space on my HDD. I reset to sync on only a few folders, but same warning. according to the screen that shows momentarily at boot, 15.10 is on sda3. I am satisfied enough with 15.10 that I don't mind deleting 14.10 and/or 15.04 to free up space. I have a G-parted disk if it comes to that. I know so little about what I am seeing that I haven't touched anything yet. Thanks in advance.

[vinnywright]

disks do not look full ,,,,,according to that partition manager shot any way.
except that swap partition is showing more used than it is ,,,,,,,

boot up and run

df -h

in a terminal and post the output.

VINNY

[GranPaSmurf]

thanks Vinny

granpasmurf@Petersen:~$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 3.7G 0 3.7G 0% /dev
tmpfs 759M 9.5M 749M 2% /run
/dev/sda6 19G 16G 2.2G 88% /
tmpfs 3.8G 26M 3.7G 1% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 3.8G 0 3.8G 0% /sys/fs/cgroup
tmpfs 759M 12K 759M 1% /run/user/1000
granpasmurf@Petersen:~$

[vinnywright]

ok ,,,,in post#1 you think /dev/sda3 is 15.10 ,,,,,,,,,the "df -h" you just posted is from a system on dev/sda6 ,,,,, is this the system that dropbox wont sync to ?

the system you are on hear only has 2GB free ,,,so if your dropbox sync is larger,,,,,,,,,,what is on /dev/sda4 ?

VINNY