From 311a4ed0c7cde4f1fd4aaa8a3232733ca555cba3 Mon Sep 17 00:00:00 2001
From: Pierre Kancir <pierre.kancir.emn@gmail.com>
Date: Thu, 21 Jan 2021 15:15:12 +0100
Subject: [PATCH] Tools: correct package_is_installed check

---
 Tools/environment_install/install-prereqs-ubuntu.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Tools/environment_install/install-prereqs-ubuntu.sh b/Tools/environment_install/install-prereqs-ubuntu.sh
index 3ab34040d0..c0d5b782ed 100755
--- a/Tools/environment_install/install-prereqs-ubuntu.sh
+++ b/Tools/environment_install/install-prereqs-ubuntu.sh
@@ -51,7 +51,7 @@ function heading() {
 }
 
 # Install lsb-release as it is needed to check Ubuntu version
-if package_is_installed "lsb-release" -eq 1; then
+if ! package_is_installed "lsb-release"; then
     heading "Installing lsb-release"
     $APT_GET install lsb-release
     echo "Done!"
@@ -229,7 +229,7 @@ if [[ -z "${DO_AP_STM_ENV}" ]] && maybe_prompt_user "Install ArduPilot STM32 too
 fi
 
 heading "Removing modemmanager package that could conflict with firmware uploading"
-if package_is_installed "modemmanager" -eq 1; then
+if package_is_installed "modemmanager"; then
     $APT_GET remove modemmanager
 fi
 echo "Done!"