Why is the graphical shell in ubuntu broken?

Question

linux

Good people please help.
Only the desktop is loaded, there is no side and top panel. Applications run through the terminal.
the following error appears in the console:
Traceback (most recent call last):
File "/usr/lib/python3.4/dbm/gnu.py", line 4, in
from _gdbm import *
ImportError: No module named '_gdbm'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/CommandNotFound/CommandNotFound.py", line 7, in
import dbm.gnu as gdbm
File "/ usr/lib/python3.4/dbm/gnu.py", line 6, in
raise ImportError(str(msg) + ', please install the python3-gdbm package')
ImportError: No module named '_gdbm', please install the python3-gdbm package
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/lib/command-not-found", line 27, in
from CommandNotFound.util import crash_guard
File "/usr/lib/python3/dist-packages/CommandNotFound/__init__.py", line 3, in
from CommandNotFound.CommandNotFound import CommandNotFound
File "/usr/lib/python3/dist- packages/CommandNotFound/CommandNotFound.py", line 9, in
import gdbm
ImportError: No module named 'gdbm'

Answer 1

Removed ubuntu and reinstalled. If it happens again, I will try debian on the advice of alexxandr

Answer 2

Step 1. remove ubuntu
Step 2. install debian and openbox.

Answer 3

please install the python3-gdbm package

- the module is "lost"?