Yuri, this sounds like a possible duplicate of some existing bug (like maybe bug 1877774 or bug 1877760). To help us confirm that please:
1. Run this command and send us the output:
gsettings list-recursively org.gnome.shell
2. Follow these instructions:
https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment
Yuri, this sounds like a possible duplicate of some existing bug (like maybe bug 1877774 or bug 1877760). To help us confirm that please:
1. Run this command and send us the output:
gsettings list-recursively org.gnome.shell
2. Follow these instructions:
https:/ /wiki.ubuntu. com/Bugs/ Responses# Missing_ a_crash_ report_ or_having_ a_.crash_ attachment