root@delllap:~# apt-get install --reinstall ubuntu-desktop
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-4.4.0-66 linux-headers-4.4.0-66-generic
  linux-image-4.4.0-66-generic linux-image-extra-4.4.0-66-generic
Use 'apt autoremove' to remove them.
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 3616 B of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://ca.archive.ubuntu.com/ubuntu xenial/main amd64 ubuntu-desktop amd64 1.361 [3616 B]
Fetched 3616 B in 0s (9285 B/s)         
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
	LANGUAGE = "es:en",
	LC_ALL = (unset),
	LC_TIME = "en_US.UTF-8",
	LC_MONETARY = "en_US.UTF-8",
	LC_ADDRESS = "en_US.UTF-8",
	LC_TELEPHONE = "en_US.UTF-8",
	LC_NAME = "en_US.UTF-8",
	LC_MEASUREMENT = "en_US.UTF-8",
	LC_IDENTIFICATION = "en_US.UTF-8",
	LC_NUMERIC = "en_US.UTF-8",
	LC_PAPER = "en_US.UTF-8",
	LANG = "en_us.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
(Reading database ... 372357 files and directories currently installed.)
Preparing to unpack .../ubuntu-desktop_1.361_amd64.deb ...
Unpacking ubuntu-desktop (1.361) over (1.361) ...
Setting up ubuntu-desktop (1.361) ...
root@delllap:~#