Public bug reported:

partman hangs when partman-basicfilesystems/no_swap is set to true and
no LVM swap partition provided in expert recipe.

* Conditions:

Ubuntu 16.04.3LTS,

Preseed configured with:

d-i partman-basicfilesystems/no_swap boolean true

d-i partman-partitioning/confirm_write_new_label boolean true
d-i partman/choose_partition select finish
d-i partman/confirm boolean true
d-i partman/confirm_nooverwrite boolean true
d-i partman-partitioning/default_label string gpt
d-i partman-auto/disk string /dev/sda
d-i partman-auto/method string lvm
d-i partman-lvm/device_remove_lvm boolean true
d-i partman-md/device_remove_md boolean true
d-i partman-lvm/confirm boolean true
d-i partman-lvm/confirm_nooverwrite boolean true
d-i partman-auto-lvm/new_vg_name string flexflash
d-i partman-auto/choose_recipe select partlayout
d-i partman-auto-lvm/guided_size string max
d-i partman-auto/expert_recipe string \
   partlayout :: \
      538 538 1075 fat32 \
         $iflabel{ gpt } \
         $reusemethod{ } \
         method{ efi } \
         format{ } \
         . \
      500 500 500 ext2 \
         method{ format } \
         format{ } \
         use_filesystem{ } \
         filesystem{ ext2 } \
         mountpoint{ /boot } \
         . \
      25600 25600 -1 xfs \
         $lvmok{ } \
         lv_name{ root } \
         method{ format } \
         format{ } \
         use_filesystem{ } \
         filesystem{ xfs } \
         mountpoint{ / } \
         .

* Issue

I believe the bug is caused by inverted return boolean in:

/lib/partman/check.d/10check_swap

if ! $swap; then
        db_input critical partman-basicfilesystems/no_swap || true
        db_go || true
        db_get partman-basicfilesystems/no_swap
        if [ "$RET" = true ]; then
                exit 1
        fi
fi

Shouldn't script return 0/true when swap not found but partman-
basicfilesystems/no_swap is set to true?

* Workaround

d-i partman/early_command string sh -c 'sed -i "s^exit 1^exit 0^"
/lib/partman/check.d/10check_swap; echo "exit 1" >>
/lib/partman/check.d/10check_swap'

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1745696

Title:
  partman hangs when partman-basicfilesystems/no_swap set and no LVM
  swap partition provided in expert recipe

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