"sudo update-apt-xapian-index" did make things better. But there is some other strange behavior of QuickSearch, e.g., with key word "linux", all those "linux-*" packages won't show up, but with "linux-", they, together with many other packages, will show up.
"sudo update- apt-xapian- index" did make things better. But there is some other strange behavior of QuickSearch, e.g., with key word "linux", all those "linux-*" packages won't show up, but with "linux-", they, together with many other packages, will show up.