vscode terminal does not come up

The terminal in vscode does not appear as follows:

If you select bash in the "Select Default Shell" section of the red area, there will be no change, and the terminal will not be displayed with the "1:" display.

I reinstalled vscode, but the situation remained the same.

Please tell me how to display the terminal.

>cat/etc/lsb-release
DISTRIB_ID = Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.3 LTS"