I'm in dire need of help.
My system has become incredibly laggy and hardly usable. I have realised that this is because for some reason I'm running without virtual memory (this is not intentional). It is a recent phenomenon and the system was much more responsive until a couple of days ago, so I can only summarise it is a recent phenomenon. I cannot think of anything I did to cause this (except attempt to use the Hibernation feature, which failed - did it maybe fill up my swap partition with garbage and leave it there? I do not know. How could I find out?)
As a novice my difficulty is compounded by the fact that I am running on a fully encrypted SSD using LUKS. Everybody keeps posting me links to pages where people have posted links, and honestly I am hopelessly out of my depth. Searching for information with a machine that takes ten seconds to register a keypress is no fun, I assure you.
(Of course this situation persists across reboots)
First, proof of the situation: swapon indicates I have no swap:
user@host:~$ sudo swapon -s
[sudo] password for user:
Filename Type Size Used Priority
user@host:~$
Secondly, the output of df, indicating how my filesystems are mounted:
user@user~$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/ubuntu--vg-root 237978256 14110548 211756044 7% /
none 4 0 4 0% /sys/fs/cgroup
udev 3829132 4 3829128 1% /dev
tmpfs 3844736 8 3844728 1% /tmp
tmpfs 768948 1256 767692 1% /run
none 5120 0 5120 0% /run/lock
none 3844736 20948 3823788 1% /run/shm
none 102400 16 102384 1% /run/user
tmpfs 3844736 0 3844736 0% /var/spool
tmpfs 3844736 24 3844712 1% /var/tmp
tmpfs 3844736 624 3844112 1% /var/log
/dev/sda1 240972 84550 143981 37% /boot
/home/user/.Private 237978256 14110548 211756044 7% /home/user
user@host:~$
Next, my /etc/fstab file, as it currently stands:
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
/dev/mapper/ubuntu--vg-root / ext4 discard,noatime,nodiratime,errors=remount-ro 0 1
# /boot was on /dev/sda1 during installation UUID=db8c65e2-82fd-492c-8f02-8ad140f7337b /boot ext2 defaults 0 2
/dev/mapper/ubuntu--vg-swap_1 none swap sw 0 0
/dev/mapper/cryptswap1 none swap sw 0 0
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
tmpfs /var/spool tmpfs defaults,noatime,mode=1777 0 0
tmpfs /var/tmp tmpfs defaults,noatime,mode=1777 0 0
tmpfs /var/log tmpfs defaults,noatime,mode=1777 0 0
Finally, I'd like to mention that I booted into a Live-USB distro, and used system-config-lvm to have a look at my unmouned LVM, and /dev/ubuntu-vg/swap_1 is indeed there.
I don't know what else to do. It's taken three hours to type this.
EDIT: adding output of cat /etc/exports/:
user@host:~$ cat /etc/exports
cat: /etc/exports: No such file or directory
user@host:~$
and the output of top
top - 19:10:16 up 32 min, 3 users, load average: 0.18, 0.11, 0.07
Tasks: 202 total, 1 running, 201 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.7 us, 0.7 sy, 0.0 ni, 98.5 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 7689472 total, 1220864 used, 6468608 free, 44020 buffers
KiB Swap: 0 total, 0 used, 0 free. 549276 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1396 root 20 0 288660 48264 40612 S 1.7 0.6 0:03.80 Xorg
2279 user 20 0 856444 16252 11668 S 1.0 0.2 0:01.67 lxterminal
3140 user 20 0 1169836 142804 60396 S 0.7 1.9 0:09.86 chrome
635 root -51 0 0 0 0 S 0.3 0.0 0:00.41 irq/62-iwlwifi
3118 ntp 20 0 33504 2136 1528 S 0.3 0.0 0:00.04 ntpd
3326 user 20 0 1038132 111152 48620 S 0.3 1.4 0:11.06 chrome
3374 user 20 0 29192 1736 1212 R 0.3 0.0 0:00.03 top
1 root 20 0 34052 3436 1484 S 0.0 0.0 0:03.97 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H
7 root 20 0 0 0 0 S 0.0 0.0 0:00.24 rcu_sched
8 root 20 0 0 0 0 S 0.0 0.0 0:00.08 rcuos/0
9 root 20 0 0 0 0 S 0.0 0.0 0:00.06 rcuos/1
10 root 20 0 0 0 0 S 0.0 0.0 0:00.07 rcuos/2
11 root 20 0 0 0 0 S 0.0 0.0 0:00.10 rcuos/3
12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuos/4
Searching around desperately (as best one can while faced with my present situation, anyway) I have found this ancient thread about somebody having problems with cryptswap, but honestly I'm too much of a novice to understand what he is on about and how to use mkswap to remake the swap partition (honestly, it isn't even clear to me what parameters I would need to pass to mkswap to avoid nuking my system by accidentally overwriting my main partition... I saw in fstab that I seem to have two entries that look swap-like (swap_1 and cryptswap) and I do not know which of the two would be the hypothetical target, not to mention all the deep jargon.)
