我安装了 Ubuntu 14.04 并选中了 LVM 加密分区选项，让安装程序按照默认行为完成其工作。当我启动时，在输入密码后，启动画面中出现一条投诉，称无法安装 SWAP 分区，并告诉我要等待，按 S 忽略或按 M 手动安装。
以下是我收集到的所有相关信息：
vmatir@vmatir-X200MA:~$ sudo swapon -a
swapon: /dev/mapper/ubuntu--vg-swap_1: la lectura de la cabecera de intercambio falló: Argumento inválido
swapon: /dev/mapper/cryptswap1: stat falló: No existe el archivo o el directorio
vmatir@vmatir-X200MA:~$
/////////////////////////////////////
The first line says: the reading of the swap header failed: invalid argument
The second line says: stat failed: the file or directory doesn't exist
////////////////////////////////////
vmatir@vmatir-X200MA:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465,8G 0 disk
├─sda1 8:1 0 512M 0 part /boot/efi
├─sda2 8:2 0 244M 0 part /boot
└─sda3 8:3 0 465G 0 part
└─sda3_crypt (dm-0) 252:0 0 465G 0 crypt
├─ubuntu--vg-root (dm-1) 252:1 0 463,1G 0 lvm /
└─ubuntu--vg-swap_1 (dm-2) 252:2 0 1,9G 0 lvm
vmatir@vmatir-X200MA:~$
// swap_1 not mounting.
vmatir@vmatir-X200MA:~$ free -m
total usado libre compart. búffers almac.
Mem: 1888 1814 73 302 56 885
-/+ buffers/cache: 872 1015
Intercambio: 0 0 0
vmatir@vmatir-X200MA:~$
vmatir@vmatir-X200MA:~$ mountall -v
/ es local
/proc es virtual
/proc/sys/fs/binfmt_misc es virtual
/sys es virtual
/sys/fs/cgroup es virtual
/sys/fs/fuse/connections es virtual
/sys/kernel/debug es virtual
/sys/kernel/security es virtual
/sys/firmware/efi/efivars es virtual
/dev es virtual
/dev/pts es virtual
/tmp es local
/run es virtual
/run/lock es virtual
/run/shm es virtual
/run/user es virtual
/sys/fs/pstore es virtual
/boot es local
/boot/efi es local
/dev/mapper/ubuntu--vg-swap_1 es swap
/dev/mapper/cryptswap1 es swap
/sys/fs/cgroup/systemd es virtual
/home/vmatir es virtual
/run/user/1000/gvfs es local
mountall: No es posible escuchar conecciones privadas: Failed to bind socket "/com/ubuntu/mountall/server/": La dirección ya se está usando
mounting event sent for /tmp
mountall: Desconectado de Upstart
vmatir@vmatir-X200MA:~$
vmatir@vmatir-X200MA:~$ cat /etc/fstab
# /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 errors=remount-ro 0 1
# /boot was on /dev/sda2 during installation
UUID=264a8a19-71da-4f00-b3f9-f90bd565b531 /boot ext2 defaults 0 2
# /boot/efi was on /dev/sda1 during installation
UUID=D764-71B4 /boot/efi vfat defaults 0 1
/dev/mapper/ubuntu--vg-swap_1 none swap sw 0 0
/dev/mapper/cryptswap1 none swap sw 0 0
vmatir@vmatir-X200MA:~$
我确实需要安装这个 SWAP 分区，因为这台笔记本电脑只有 1.8GB 的 RAM，而且如果电脑不完全冻结，我几乎看不到我的邮件。
答案1
感谢@Palantir，修复正在运行：sudo mkswap /dev/mapper/ubuntu--vg-swap_1
并注释掉最后一行或者删除/etc/fstab的最后一行：
vmatir@vmatir-X200MA:~$ cat /etc/fstab
# /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 errors=remount-ro 0 1
# /boot was on /dev/sda2 during installation
UUID=264a8a19-71da-4f00-b3f9-f90bd565b531 /boot ext2 defaults 0 2
# /boot/efi was on /dev/sda1 during installation
UUID=D764-71B4 /boot/efi vfat defaults 0 1
/dev/mapper/ubuntu--vg-swap_1 none swap sw 0 0
vmatir@vmatir-X200MA:~$
现在交换分区在启动时挂载：
vmatir@vmatir-X200MA:~$ free -m
total usado libre compart. búffers almac.
Mem: 1888 1619 268 201 57 781
-/+ buffers/cache: 780 1107
Intercambio: 1931 0 1931
vmatir@vmatir-X200MA:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465,8G 0 disk
├─sda1 8:1 0 512M 0 part /boot/efi
├─sda2 8:2 0 244M 0 part /boot
└─sda3 8:3 0 465G 0 part
└─sda3_crypt (dm-0) 252:0 0 465G 0 crypt
├─ubuntu--vg-root (dm-1) 252:1 0 463,1G 0 lvm /
└─ubuntu--vg-swap_1 (dm-2) 252:2 0 1,9G 0 lvm [SWAP]
vmatir@vmatir-X200MA:~$