Mark, thanks for the quick reply!
I searched in the ubuntu forum, found a few related topics, but it turned out the solutions provided by ubuntu forum didn’t solve my problem.
Then I found a interesting thing:
- Open “Preferences” > “LXQt settings” -> “Keyboard and Mouse”;
- In the “Mouse” tab, set “Double click interval” to “1000 ms” (it was “400 ms” by default).
- Close the settings dialog.
I tried double-tap again.
If the double-tap is completed in a slow motion, something like 600 ms between tow single-taps, then the folders and files can be opened; if the double-tap is completed in a fast motion, then nothing happens.
So my guess is the system mistakenly treated the quick double-tap as something like “single-click”. But a slow double-tap (with long enough “Double click interval”) won’t be mistakenly treated, so the folders can be opened.
Is it LXQt related or Ubuntu related?