sudo apt update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease                                                                                                     
Hit:2 http://ppa.launchpad.net/fixnix/netspeed/ubuntu xenial InRelease                                                                                           
Hit:3 http://packages.microsoft.com/repos/vscode stable InRelease                                                                     
Hit:4 http://archive.canonical.com/ubuntu xenial InRelease                                                                            
Hit:5 http://security.ubuntu.com/ubuntu xenial-security InRelease                         
Hit:6 http://in.archive.ubuntu.com/ubuntu xenial InRelease                                                           
Hit:7 http://repository.spotify.com stable InRelease                                                                 
Hit:8 http://ppa.launchpad.net/inkscape.dev/stable/ubuntu xenial InRelease                     
Hit:9 http://dl.google.com/linux/chrome/deb stable Release                                    
Hit:10 http://in.archive.ubuntu.com/ubuntu xenial-updates InRelease      
Hit:11 http://ppa.launchpad.net/nathandyer/vocal-stable/ubuntu xenial InRelease
Hit:12 http://in.archive.ubuntu.com/ubuntu xenial-backports InRelease    
Hit:13 http://ppa.launchpad.net/neovim-ppa/stable/ubuntu xenial InRelease
Hit:15 http://ppa.launchpad.net/twodopeshaggy/jarun/ubuntu xenial InRelease
Reading package lists... Done                       
Building dependency tree       
Reading state information... Done
4 packages can be upgraded. Run 'apt list --upgradable' to see them.


sudo apt install gpredict
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package gpredict


apt list --upgradable
Listing... Done
libgl1-mesa-glx/xenial-updates 17.0.7-0ubuntu0.16.04.1 amd64 [upgradable from: 12.0.6-0ubuntu0.16.04.1]
libglapi-mesa/xenial-updates 17.0.7-0ubuntu0.16.04.1 amd64 [upgradable from: 12.0.6-0ubuntu0.16.04.1]
libgles2-mesa/xenial-updates 17.0.7-0ubuntu0.16.04.1 amd64 [upgradable from: 12.0.6-0ubuntu0.16.04.1]
xserver-xorg-hwe-16.04/xenial-updates 1:7.7+16ubuntu3~16.04.1 amd64 [upgradable from: 1:7.7+13ubuntu4~16.04.2]


sudo apt upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  libappstream4 libgles1-mesa libstemmer0d linux-headers-4.4.0-77 linux-headers-4.4.0-77-generic linux-headers-4.8.0-36 linux-headers-4.8.0-36-generic
  linux-headers-4.8.0-51 linux-headers-4.8.0-51-generic linux-headers-4.8.0-52 linux-headers-4.8.0-52-generic linux-headers-4.8.0-53
  linux-headers-4.8.0-53-generic linux-headers-4.8.0-54 linux-headers-4.8.0-54-generic linux-headers-4.8.0-56 linux-headers-4.8.0-56-generic
  linux-headers-4.8.0-58 linux-headers-4.8.0-58-generic linux-image-4.4.0-77-generic linux-image-4.8.0-36-generic linux-image-4.8.0-51-generic
  linux-image-4.8.0-52-generic linux-image-4.8.0-53-generic linux-image-4.8.0-54-generic linux-image-4.8.0-56-generic linux-image-4.8.0-58-generic
  linux-image-extra-4.4.0-77-generic linux-image-extra-4.8.0-36-generic linux-image-extra-4.8.0-51-generic linux-image-extra-4.8.0-52-generic
  linux-image-extra-4.8.0-53-generic linux-image-extra-4.8.0-54-generic linux-image-extra-4.8.0-56-generic linux-image-extra-4.8.0-58-generic
  linux-signed-image-4.8.0-51-generic linux-signed-image-4.8.0-52-generic linux-signed-image-4.8.0-53-generic linux-signed-image-4.8.0-54-generic
  linux-signed-image-4.8.0-56-generic linux-signed-image-4.8.0-58-generic snap-confine
Use 'sudo apt autoremove' to remove them.
The following packages have been kept back:
  libgl1-mesa-glx libglapi-mesa libgles2-mesa xserver-xorg-hwe-16.04
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.