All commands and the written guide: https://mutschler.eu/linux/install-guides/pop-os-btrfs-20-04
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In the following I will show how to install Pop!_OS 20.04 with the following structure:
- a BTRFS-LVM-inside-LUKS partition for the root filesystem
- the BTRFS logical volume contains a subvolume `@` for `/`, a subvolume `@home` for `/home`, and another subvolume `@swap` for a swapfile. Note that the POP!_OS installer does not create subvolumes on BTRFS besides the top-level one.
- Timeshift is set up to automatically create snapshots of the system
- If you are interested in a RAID 1, there is another guide where I show how to set up a RAID 1 using BTRFS: https://mutschler.eu/linux/install-guides/pop-os-btrfs-raid1-20-04
- Note my blatherings on some cool stuff with BTRFS and why I use it: https://mutschler.eu/linux/btrfs
- Check out my fork of the following utility which automatically takes snapshots of your system after any APT command and also rsyncs your boot and/or efi partition: https://github.com/wmutschl/timeshift-autosnap-apt


**Timestamps**
0:01 Step 1: Boot the install, check UEFI mode and open interactive root shell
1:25 Step 2: Prepare partitions manually
2:55 - Create partition table and layout
5:04 - Create luks partition
8:00 Step 3: Install POP!_OS using the graphical installer
11:35 Step 4: Post-Installation steps
12:00 - Mount the btrfs top-level root filesystem
14:00 - Create btrfs subvolumes @, @home and @swap
18:20 - Create a btrfs swapfile
20:31 - Adjust your fstab
21:15 - Adjust options for systemd boot and kernelstub
24:15 Step 5: Reboot, some checks, and update system
29:35 Step 6: Install Timeshift and configure auto-snapshots

IMPORTANT NOTES (I updated the written guide)
- The mount options for @swap were not optimal, please use these ones:
UUID=UUID_of_cryptdata-data--root /swap btrfs defaults,subvol=@swap,compress=no 0 0
- please already install btrfs-progs in the chroot, otherwise the system goes to busy box

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