In practice you hardly ever encounter a serious bug while running Linux.

The operating system and its fundamental utility programs are too important to contain serious bugs.

Most of the serious bugs were fixed in a patch for Windows.

However, critics noted some serious bugs in the game.

Unfortunately, it fell short of those expectations and shipped with a few serious bugs.

The first beta release is reasonably stable, but still has a few serious bugs.

Now, gallery living is a habit with him, and collecting is a serious bug.

They only care about "support" if their device has serious bugs that impair usability.

Assuming the programmer has done a good job at building an application without any serious bugs, it should run just fine on the operating system.

More serious bugs may cause the program to crash or freeze.