I havent used my Ubuntu for quite a long time. Today, when I booted Ubuntu (14.04 LTS), the software updater and Software & Updates (from Settings) are not working.
The software updater's window will show up for around 1 sec, but it will close automatically. Software & Updates is never shown, no matter how many times I click the icon. Note that neither of them show any error message.
Those 2 features were working perfectly the last time I used Ubuntu. I want to do some system upgrade and update.
For now, I use
sudo apt-get update && sudo apt-get upgrade. This command runs very fast, meaning (I think) my Ubuntu is not updated properly. The update from software updater always has a big size hence the download should be slower.
What should I do?
Can I just uninstall and reinstall both of them? If I can, how to do it?
Just to clarify, I don't want to upgrade my Ubuntu version (I want the LTS one), I just want to upgrade the software/packages I used.
Thanks for your time.