A few answers, you can take your pick from:

• We aren't Ubuntu Forums, we're Ask Ubuntu.
• The software the drives the two websites is different.
• We don't use BBCode, we use Markdown (see this link for formatting guides, including code).

tldr For blocks of code, prepend the line with four spaces, for shorter blocks, wrap in `` (backticks).

A few answers, you can take your pick from:

• We aren't Ubuntu Forums, we're Ask Ubuntu.
• The software the drives the two websites is different.
• We don't use BBCode, we use Markdown (see this link for formatting guides, including code).

tldr For blocks of code, prepend the line with four spaces, for shorter blocks, wrap in `` (backticks).