If you are experiencing Wi-Fi connection issues on Ubuntu Linux after a software upgrade, there are a few steps you can take to troubleshoot, correct the problem, and prevent it from happening again in the future.

Here are the steps you can follow:

1. Check Wi-Fi network settings

   The first thing to do when experiencing Wi-Fi connection issues is to check the Wi-Fi network settings. Ensure that the Wi-Fi is enabled, the correct network name and password have been entered, and the Wi-Fi signal is strong. You can do this by clicking on the network icon in the top-right corner of the screen and selecting ''Wi-Fi Settings.''

2. Restart your Wi-Fi router and modem

   Sometimes, Wi-Fi connection issues are caused by problems with the router or modem. To fix this, restart your Wi-Fi router and modem by unplugging them from the power source for a few minutes and plugging them back in. Wait for the router and modem to restart and then try connecting to the Wi-Fi network again.

3. Reset your network connection

   If the above steps do not work, try resetting your network connection. You can do this by opening a terminal and running the following commands:

   sudo service network-manager stop
   sudo rm /var/lib/NetworkManager/NetworkManager.state
   sudo service network-manager start
   			

   This will stop the network manager, delete its state file, and restart it. Wait for the network manager to restart and then try connecting to the Wi-Fi network again.

4. Update your Ubuntu Linux software

   If the above steps do not work, try updating your Ubuntu Linux software to the latest version. This may include updates to the network manager or Wi-Fi drivers that could resolve the issue.

   You can update your Ubuntu Linux software by running the following commands in the terminal:

   sudo apt update
   sudo apt upgrade
   			

   These commands will update all installed packages on your Ubuntu Linux system to the latest available version. If any updates are available for the network manager or Wi-Fi drivers, they will be installed as part of this process.

5. Install proprietary Wi-Fi drivers

   If none of the above steps work, you may need to install proprietary Wi-Fi drivers for your device. To do this, you can use the Additional Drivers tool in Ubuntu.

   To access the Additional Drivers tool, open the ''Software & Updates'' application and click on the ''Additional Drivers'' tab. This will show a list of available drivers for your device. Select the appropriate driver and click ''Apply Changes'' to install it.

6. Prevent the issue from happening again

   To prevent Wi-Fi connection issues from happening again in the future, it's important to keep your Ubuntu Linux software up to date. This includes regular updates to the network manager and Wi-Fi drivers.

   You should also avoid making major