In Ubuntu, open the “Disks” application. On the left pane, select the primary hard drive.
On the right, click the “Cogs” icon and select “SMART Data and Tests…”.
From the window that pop up, you will be able to see the status of your SSD.
Note: In most cases, it will notify you when it detects issue with the SSD, so you don’t have to check it very frequently. Image credit: HDD vs. SSD Test