Merge ~swem/ubiquity/+git/ubiquity:lp1772374 into ubiquity:master

[Chen-Han Hsiao (Stanley)]

[Mathieu Trudel-Lapierre (cyphermox)]

review: Approve

diff --git a/scripts/plugininstall.py b/scripts/plugininstall.py
index 70c3aa9..25b30b3 100755
--- a/scripts/plugininstall.py
+++ b/scripts/plugininstall.py
@@ -954,7 +954,8 @@ class Install(install_misc.InstallBase):
 
         inst_boot = self.db.get('ubiquity/install_bootloader')
         if inst_boot == 'true' and 'UBIQUITY_NO_BOOTLOADER' not in os.environ:
-            binds = ("/proc", "/sys", "/dev", "/run")
+            binds = ("/proc", "/sys", "/dev", "/run",
+                     "/sys/firmware/efi/efivars")
             for bind in binds:
                 misc.execute('mount', '--bind', bind, self.target + bind)