[Bug 1767299] Re: Ubuntu 18.04 Installer creates swap partition too small

[Piotr Morgwai Kotarbiński]

- high memory systems for desktop machines are rare: most people using desktop version of ubuntu have way more disk than RAM.
- it is quite hard for a non-expert user who just wants a secure system with encrypted disk and use hibernation to resize lvm partitions: there's no GUI tool for it, so he needs to learn to use several lvm command line tools
- although there are good reasons not to enable hibernation by default, it should be easy to enable it manually later as it is important for many laptop users.
- moreover, installer could be simply detecting if a given system is a high-memory one instead of applying strict defaults blindly: swap space could be capped for example with min(2*RAM, 0.2*disk)
- if taking into consideration disk size when deciding swap size is too difficult for any reason, there could be at least an option in the installer *GUI*: dealing with preseeding is also difficult for an average user for whom creating a bootable pendrive was already a challenge

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https://bugs.launchpad.net/bugs/1767299

Title:
  Ubuntu 18.04 Installer creates swap partition too small

Status in partman-auto package in Ubuntu:
  Confirmed

Bug description:
  Installed Ubuntu 18.04 final release.

  The disk is 512 Gigabyte, the RAM is 8 Gigabyte. The installer just
  gave me 979 Megabyte of space. I chose LVM to have an encrypted drive.

  Here are some details:

  free -h
                total        used        free      shared  buff/cache   available
  Mem:           7,7G        4,0G        152M        399M        3,6G        3,0G
  Swap:          979M          0B        979M


  swapon --show
  NAME      TYPE      SIZE USED PRIO
  /dev/dm-2 partition 980M   0B   -2

  
  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=removed-id /boot           ext4    defaults        0       2
  # /boot/efi was on /dev/sda1 during installation
  UUID=removed-id  /boot/efi       vfat    umask=0077      0       1
  /dev/mapper/ubuntu--vg-swap_1 none            swap    sw              0       0

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