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27

"Swap not available" - I must manually "swapon" after every reboot

rated 0 times [ 27] [ 0] / answers: 1 / hits: 24937 / 3 Years ago, thu, september 30, 2021, 8:40:35

I am on Ubuntu 12.04, Thinkpad Edge 13, encrypted home. A message in the System Monitor tells me that swap is "not available". I can get it back using the swapon option in gparted (I thought I could also do sudo swapon -a in a terminal, but that does not work). The problem is that I have to swapon after every reboot. How can I switch it back on so it stays on even after a reboot?

my fstab:

# # <file system> <mount point> <type> <options> <dump> <pass> 

proc /proc proc nodev,noexec,nosuid 0 0 

# / was on /dev/sda5 during installation 

UUID=47641b93-9d12-4e6a-b803-dde28f0e5725 / ext4 errors=remount-ro 0 1

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answered 3 Years ago leadprogres · Accepted Answer

You have no configuration for swap in /etc/fstab. Add following line to that file:

UUID=<uuid> none   swap    sw    0       0

You have to replace <uuid> with the uuid of your swap partition. To do that, run sudo blkid

$ sudo blkid

/dev/sda1: LABEL="System Reserved" UUID="88A0D0A1A0D09752" TYPE="ntfs" 

/dev/sda2: UUID="0620D9F920D9EFA3" TYPE="ntfs" 

/dev/sda5: UUID="c282b418-2045-4852-8789-88a44360a0bb" TYPE="ext4" 

/dev/sda6: UUID="f99c6a0c-790a-45ca-a1a9-8874f5a2999b" TYPE="ext4" 

/dev/sda7: UUID="4cc2e909-ebd1-4c72-abee-aa32035bf330" TYPE="swap"

This is a list of my partitions, and as you see, /dev/sda7 is my swap partition. So you can copy the value of UUID corresponding to your swap, omitting the quotes, and use it for your fstab file.