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=== Description (from pull-request) ===
This solves [LP #1862550](https://bugs.launchpad.net/ubuntuwsl/+bug/1862550) by skipping directly if it detects that it is using WSL. 

The reason for doing this is that WSL does not support snap, and:

1. to reduce the confusion for WSL users who tries to update; and
2. to prevent the issue of broken dependencies during the upgrade to Ubuntu 20.04 LTS on WSL.

The last PR does not have a sign-off so I re-opened one.

Signed-off-by: Jinming Wu, Patrick <me@patrickwu.space>
From 85e77b5e9574a0a421ca2a1e2c2fec54849c40ea Mon Sep 17 00:00:00 2001
From: "Jinming Wu, Patrick" <me@patrickwu.space>
Date: Fri, 17 Apr 2020 09:40:43 +0800
Subject: [PATCH] Properly handling for WSL upgrade

Signed-off-by: Jinming Wu, Patrick <me@patrickwu.space>
---
 debian/lxd.preinst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/debian/lxd.preinst b/debian/lxd.preinst
index aede3e04..20aa071b 100644
--- a/debian/lxd.preinst
+++ b/debian/lxd.preinst
@@ -23,6 +23,12 @@ case "$1" in
         COUNT=0
         SKIP=false
         while :; do
+            if [ -f /proc/sys/fs/binfmt_misc/WSLInterop ]; then
+                echo "===> WSL detected; Skipping migration"
+                SKIP=true
+                break
+            fi
+
             snap info lxd >/dev/null 2>&1 && break
 
             db_fset lxd/snap-no-connectivity seen false
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