3

This was after apt update, apt-dist-upgrade:

root@_____:~# cat /etc/os-release 
NAME="Ubuntu"
VERSION="16.04.6 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.6 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

root@_____:~# do-release-upgrade 
Checking for a new Ubuntu release
No new release found.
Karel Adams
  • 216

1 Answers1

1

Step 1: Upgrade the packages to the latest version for 16.04 decreases the chance of something going wrong during the upgrade to version 18.04. Run the command below 

sudo apt update && sudo apt upgrade

Step 2: Install the Ubuntu Update Manager.

sudo apt install update-manager-core

Step 3: Upgrade Ubuntu

sudo do-release-upgrade

Step 4: After the upgrade is complete, a restart will be required.

Step 5:To check what version of Ubuntu is currently installed, use the command below.

lsb_release -a

If that does not work, you need to follow these steps

Step 1: Edit apt configuration

Press Ctrl Alt T to open terminal Now, type 

sudo nano /etc/apt/apt.conf

Step 2: Change the config:

APT::Default-Release *;

Note If the apt.conf file does not exist, create your own user file in /etc/apt/apt.conf.d so you can guarantee that it won't be overwritten by package updates. Use the command to create the file

sudo touch /etc/apt/apt.conf.d/apt.conf

Then to edit your file run

sudo nano /etc/apt/apt.conf.d/apt.conf

Add this line to the file

 APT::Default-Release *;
Tejas Lotlikar
  • 2,985