Encountered the same situation...getting a recurring crash in plasmashell under Kubuntu 19.04 (but only when I've left the computer unattended for hours; it's never occurred when I'm sitting at the terminal). Crash handler told me which debug symbols I needed for a useful bug report, so I found the appropriate packages and installed all of them (including 'plasma-workspace-dbgsym' for '/usr/bin/plasmashell'), but the crash handler still claims I am missing debug symbols for '/usr/bin/plasmashell'.
Encountered the same situation...getting a recurring crash in plasmashell under Kubuntu 19.04 (but only when I've left the computer unattended for hours; it's never occurred when I'm sitting at the terminal). Crash handler told me which debug symbols I needed for a useful bug report, so I found the appropriate packages and installed all of them (including 'plasma- workspace- dbgsym' for '/usr/bin/ plasmashell' ), but the crash handler still claims I am missing debug symbols for '/usr/bin/ plasmashell' .