I've installed Ubuntu 14.04 LTS about one month ago, I'm dual booting Ubuntu 14.04 LTS and Windows 8.1.
I didn't create any swap space while installation but now I really need to add this for Ubunutu. I tried checking for any assigned swap space by using sudo swapon -s
and I got empty headers like shown below:
ahsan@ahsan-Inspiron-N5110:~$ sudo swapon -s
Filename Type Size Used Priority
Then I tried to allocate some swap space using dd of=output.dat bs=1 seek=390143672 count=0
and the output was:
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.000170607 s, 0.0 kB/s
I also tried the command sudo dd if=/dev/zero of=/swapfile bs=1G count=4
and output was:
dd: memory exhausted by input buffer of size 1073741824 bytes (1.0 GiB)
Then I tried sudo fallocate -l 4G /swapfile
but output was:
fallocate: /swapfile: fallocate failed: Operation not supported
I aslo checked my hard drives following is my hard drive structure:
ahsan@ahsan-Inspiron-N5110:~$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 99G 18G 77G 19% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 1.4G 4.0K 1.4G 1% /dev
tmpfs 286M 1.2M 284M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 1.4G 24M 1.4G 2% /run/shm
none 100M 56K 100M 1% /run/user
And the output of free -m
is:
ahsan@ahsan-Inspiron-N5110:~$ free -m
total used free shared buffers cached
Mem: 2850 2665 184 421 25 846
-/+ buffers/cache: 1794 1055
Swap: 0 0 0
Please show me how can I add the swap without affecting any data of mine. I've installed 64 bit Ubuntu LTS and have 3GB of RAM and a 500GB hard drive.
I have been to this Ask Ubuntu question and I tried the commands and the output is:
ahsan@ahsan-Inspiron-N5110:~$ sudo dd if=/dev/zero of=/swapspace bs=1G count=4
4+0 records in
4+0 records out
4294967296 bytes (4.3 GB) copied, 47.1951 s, 91.0 MB/s
ahsan@ahsan-Inspiron-N5110:~$ sudo dd if=/dev/zero of=/swapspace bs=1G count=4sudo mkswap /swapspace
dd: invalid number ‘4sudo’
ahsan@ahsan-Inspiron-N5110:~$
Best Answer
First, to create 4,000 MB of swap space:
or
Next turn it into a usable swap file:
Activate it:
Confirm active swap spaces:
Next, add the following line to /etc/fstab to activate the new swap at boot:
See also this wiki page: https://help.ubuntu.com/community/SwapFaq