Public bug reported:

On some EFI environments (for example Parallels VM) efivarfs is not available.
Missing mount breaks boot.

I suggest following change as solution:
--- a/src/fstab
+++ b/src/fstab
@@ -13,7 +13,7 @@
 none            /sys/fs/fuse/connections  fusectl         optional             
                        0 0
 none            /sys/kernel/debug         debugfs         optional             
                        0 0
 none            /sys/kernel/security      securityfs      optional             
                        0 0
-none            /sys/firmware/efi/efivars efivarfs        optional             
                        0 0
+none            /sys/firmware/efi/efivars efivarfs        nobootwait           
                        0 0
 none            /spu                      spufs           gid=spu,optional     
                        0 0
 none            /dev                      devtmpfs,tmpfs  mode=0755            
                        0 0
 none            /dev/pts                  devpts          
noexec,nosuid,gid=tty,mode=0620              0 0

** Affects: mountall (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  On some EFI environments (for example Parallels VM) efivarfs is not available.
  Missing mount breaks boot.
  
  I suggest following change as solution:
- diff -Nru mountall-2.52.orig/src/fstab mountall-2.52/src/fstab
  --- a/src/fstab
  +++ b/src/fstab
  @@ -13,7 +13,7 @@
-  none            /sys/fs/fuse/connections  fusectl         optional           
                          0 0
-  none            /sys/kernel/debug         debugfs         optional           
                          0 0
-  none            /sys/kernel/security      securityfs      optional           
                          0 0
+  none            /sys/fs/fuse/connections  fusectl         optional           
                          0 0
+  none            /sys/kernel/debug         debugfs         optional           
                          0 0
+  none            /sys/kernel/security      securityfs      optional           
                          0 0
  -none            /sys/firmware/efi/efivars efivarfs        optional           
                          0 0
  +none            /sys/firmware/efi/efivars efivarfs        nobootwait         
                          0 0
-  none            /spu                      spufs           gid=spu,optional   
                          0 0
-  none            /dev                      devtmpfs,tmpfs  mode=0755          
                          0 0
-  none            /dev/pts                  devpts          
noexec,nosuid,gid=tty,mode=0620              0 0
+  none            /spu                      spufs           gid=spu,optional   
                          0 0
+  none            /dev                      devtmpfs,tmpfs  mode=0755          
                          0 0
+  none            /dev/pts                  devpts          
noexec,nosuid,gid=tty,mode=0620              0 0

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https://bugs.launchpad.net/bugs/1265990

Title:
  efivarfs shouldn't block boot

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