@@ -932,7 +932,7 @@ function is_package_installed() {

     fi

     if [[ "$os_PACKAGE" = "deb" ]]; then

-        dpkg -l "$@" > /dev/null 2> /dev/null

+        dpkg -s "$@" > /dev/null 2> /dev/null

     elif [[ "$os_PACKAGE" = "rpm" ]]; then

         rpm --quiet -q "$@"

     else

@@ -367,3 +367,25 @@ if [[ "$VAL" -ne 0 ]]; then

 else

     echo "is_package_installed() on non-existing package failed"

 fi

+

+# test against removed package...was a bug on Ubuntu

+if is_ubuntu; then

+    PKG=cowsay

+    if ! (dpkg -s $PKG >/dev/null 2>&1); then

+        # it was never installed...set up the condition

+        sudo apt-get install -y cowsay >/dev/null 2>&1

+    fi

+    if (dpkg -s $PKG >/dev/null 2>&1); then

+        # remove it to create the 'un' status

+        sudo dpkg -P $PKG >/dev/null 2>&1

+    fi

+

+    # now test the installed check on a deleted package

+    is_package_installed $PKG

+    VAL=$?

+    if [[ "$VAL" -ne 0 ]]; then

+        echo "OK"

+    else

+        echo "is_package_installed() on deleted package failed"

+    fi

+fi