Please try:
cd /home/bob1/.cache/ rm -rf apport apport-collect 1975557
If that doesn't work then maybe consider opening a new bug with the same info:
ubuntu-bug gnome-shell
Please try:
cd /home/bob1/.cache/
rm -rf apport
apport-collect 1975557
If that doesn't work then maybe consider opening a new bug with the same info:
ubuntu-bug gnome-shell