Just because I am afraid this page might some day get deleted, I am copy pasting here the answer, which was very useful to me, when I needed to increase the size of the SWAP partition of my freshly installed Xubuntu 22.04, after I selected the "encrypted LVM partition" option in the install wizard. I am adding some commands and missing bits of information too.
Before increasing the size, I needed to decrease the size of its neighboring root volume, as the sum of both LVM volumes was equal to the capacity of my disk. Here I add another 7G to my SWAP partition.
First, check what your LVM disk currently looks like, running
lsblk # └─sda6 8:6 0 464,6G 0 part # └─sda6_crypt 253:0 0 464,5G 0 crypt # ├─vgubuntu-root 253:1 0 463,6G 0 lvm / # └─vgubuntu-swap_1 253:2 0 980M 0 lvm [SWAP]
Now, boot your Linux from a USB stick and open a terminal:
sudo su # `sudo` => Execute a command as another user. # `sudo su [user]` => Run a command with substitute user, default is root. # Encrypted device should NOT be unlocked lsblk # => list block devices # └─sda6 => no `crypt`/`lvm`` # Unlock encrypted device cryptsetup open /dev/sda6 crypt # Enter passphrase # `cryptsetup` => Manage dm-crypt + LUKS encrypted volumes. # `cryptsetup open <device> <name>` => Opens encrypted lv as <name> # Get logical volume identifiers lsblk # └─sda6 8:6 0 464,6G 0 part # └─sda6_crypt 253:0 0 464,5G 0 crypt # ├─vgubuntu-root 253:1 0 463,6G 0 lvm / # └─vgubuntu-swap_1 253:2 0 980M 0 lvm [SWAP] # Shrink logical root volume AND filesystem lvresize --verbose --resizefs -L -7G /dev/mapper/vgubuntu-root # `lvresize` <volume> => resize a logical volume # --verbose => Give more info. # --resizefs => Resize filesystem AND LV with fsadm(8). # -L => Specifies the new size of the LV, # +/- add/subtracts to/from current size, g|G is GiB. # Check filesystem of logical root volume for errors e2fsck -f /dev/mapper/vgubuntu-root # `e2fsck`<fs-path> => Check a Linux ext2/ext3/ext4 file system # -f => Force checking even if the file system seems clean. # Increase swapsize lvresize --verbose -L +7G /dev/mapper/vgubuntu-swap_1 # Format to make it usable mkswap /dev/mapper/vgubuntu-swap_1
Now, deactive the volume group:
vgchange -a n or
vgchange -a n sda6_crypt.
cryptsetup close crypt; reboot
After rebooting, check the sizes using
swapon -s and
free -h. That's it!