Is there any way to find something in byobu window?

Solution 1:

Press the F7, or Alt-PgUp Alt-PgDown to enter byobu scrollback mode. This allows you to navigate past output using vi like commands. Here is a quick list of movement commands:

h - Move the cursor left by one character
j - Move the cursor down by one line
k - Move the cursor up by one line
l - Move the cursor right by one character
0 - Move to the beginning of the current line
$ - Move to the end of the current line
G - Moves to the specified line (defaults to the end of the buffer)
ctrl + b - Page up
ctrl + f - Page down

/ - Search forward
? - Search backward

n - Moves to the next match, either forward or backword