Adding Swap File to Currently Installed Ubuntu OS

1. Create a file with a size you prefer.

# sudo dd if=/dev/zero of=/mnt/512Mb.swap bs=1M count=512

2. Format the created file

# sudo mkswap /mnt/512Mb.swap

3. Add the swap to the running system.

# sudo swapon /mnt/512Mb.swap

to check if the swap file has been activated use # cat /proc/meminfo or # free -t

4. To make the swap permanent every other boot.

# gksudo gedit /etc/fstab

Add the line at the end of the file

/mnt/512Mb.swap none swap sw 0 0

5. Save and reboot the system.

source: help.ubuntu

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