Fix various bugs.

install.sh

@@ -34,19 +34,16 @@ IFS=$'\n'
 declare -a dsks=( $(lsblk -d | tail -n+2 | awk '{print $1" "$4}') )
 
 # Select value on array.
-select dev in "${dsks[@]}"
-do
-
-break
+select dev in "${dsks[@]}"; do
+    break
 done
 echo
 
 # Separate values by spaces.
 IFS=' '
 
-# Create new variable of selection.
-array=("${dev}")
-dev="${array[0]}"
+# Cut size from variable
+dev=${dev%% *}
 
 clear
 
@@ -107,7 +104,7 @@ echo
 
 # Creating system partition.
 echo "Creating system partition."
-sudo parted "/dev/${dev}" -- mkpart 512MB 100%
+sudo parted "/dev/${dev}" -- mkpart root 512MB 100%
 echo
 
 # Print partitions.
@@ -177,7 +174,7 @@ echo
 # Copy existing config
 sudo nixos-generate-config --root /mnt
 sudo mv /mnt/etc/nixos/configuration.nix /mnt/etc/nixos/configuration.nix.bak
-cp configuration.nix /mnt/etc/nixos
+sudo cp configuration.nix /mnt/etc/nixos
 
 # Replace username in config
 sudo sed -i "s/username/${user}/g" /mnt/etc/nixos/configuration.nix