diff --git a/.gitmodules b/.gitmodules
index 3dc1c36..253220a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,3 @@
-[submodule ".vim/pack/dist/opt/nerdtree"]
-	path = .vim/pack/dist/opt/nerdtree
-	url = https://github.com/preservim/nerdtree.git
 [submodule ".vim/pack/dist/opt/vim-better-whitespace"]
 	path = .vim/pack/dist/opt/vim-better-whitespace
 	url = https://github.com/ntpeters/vim-better-whitespace.git
diff --git a/.vim/pack/dist/opt/nerdtree b/.vim/pack/dist/opt/nerdtree
deleted file mode 160000
index e731b84..0000000
--- a/.vim/pack/dist/opt/nerdtree
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit e731b845590017493224dfcb7403c2332105b700
diff --git a/bin/mouse_360 b/bin/mouse_360
index cf1d705..97dbf85 100755
--- a/bin/mouse_360
+++ b/bin/mouse_360
@@ -4,5 +4,5 @@
 
 sleep 3
 for _ in {0..1023}; do
-    xdotool mousemove_relative 8 0 
+    xdotool mousemove_relative 8 0
 done
diff --git a/bin/virt-manager-launcher b/bin/virt-manager-launcher
index a2aed8d..1b52bb8 100755
--- a/bin/virt-manager-launcher
+++ b/bin/virt-manager-launcher
@@ -1,18 +1,16 @@
 #!/usr/bin/bash
 
-if [ "$EUID" != '0' ]; then
-    echo 'error: you cannot perform this operation unless you are root.'
+set -e
+
+if [ "$EUID" == 0 ]; then
+    echo 'error: cannot be root.'
     exit 1
 fi
 
-systemctl start libvirtd
-virsh net-start default
+sudo systemctl start libvirtd
+sudo virsh net-start default
 
-if [ -n "$SUDO_USER" ]; then
-    su "$SUDO_USER" -c 'virt-manager --no-fork'
-else
-    virt-manager --no-fork
-fi
+virt-manager --no-fork
 
-virsh net-destroy default
-systemctl stop libvirtd
+sudo virsh net-destroy default
+sudo systemctl stop libvirtd