Why can't I see the graphical interface in Ubuntu 16.04 x64?

Hello! I have on my computer is Ubuntu 16.04 x64 with Unity. Decided to put the Cinnamon DE, set, everything started. Then I removed Unity
sudo apt remove unity and rebooted the PC. Now at startup I see an error:
The system is running in low-graphics mode. Your screen,graphic card and input device settings could not be detected correctly. You will need to configure these yourself.
As I understand, with Unity I lost some settings that I have to re-deliver. How to restore the graphical interface(Cinnamon)?
UPD: Apparently demolished the unity-greeter with unity, but to edit the file /etc/lightdm/lightdm.conf somehow fails (insufficient permissions) even as root.
June 27th 19 at 15:04
1 answer
June 27th 19 at 15:06
sudo apt-get install ubuntu-desktop

It will put the stock Ubuntu environment, including everything you need for working with graphics.
The Internet connection is performed wirelessly using a wifi adapter. Unfortunately, I don't know how to connect to wifi network using console. - Glennie_Beie commented on June 27th 19 at 15:09
: Let us once to write, so as not to duplicate answers - Roger.Erns commented on June 27th 19 at 15:12
That's all remontiroval
mount /dev/sdb1 /mnt - Glennie_Beie commented on June 27th 19 at 15:15
: Now on top of this:
mount --bind /dev /mnt/dev
mount --bind /proc /mnt/proc
mount --bind /sys /mnt/sys


And the Internet in the chroot should appear - Roger.Erns commented on June 27th 19 at 15:18
:
root@ubuntu:~# mount /dev/sdb1 /mnt
root@ubuntu:~# mount --bind /dev /mnt/dev
root@ubuntu:~# mount --bind /proc /mnt/proc
root@ubuntu:~# mount --bind /sys /mnt/sys
root@ubuntu:~# chroot /mnt

No Internet (although now sitting in Mozilla Firefox from the same LiveUSB) - Glennie_Beie commented on June 27th 19 at 15:21
root@ubuntu:/# ping -c 5 google.com
ping: unknown host google.com
- Glennie_Beie commented on June 27th 19 at 15:24
: Try to ping 8.8.8.8 if it works - then:
cp /etc/resolv.conf /mnt/etc/resolv.conf

This file will still be overwritten when you start a live system. - Roger.Erns commented on June 27th 19 at 15:27
: The IP of dares pinged, the problem with the Internet is solved
root@ubuntu:~# ping -c 5 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=58 time=9.17 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=58 time=8.88 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=58 time=7.34 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=58 time=7.68 ms
64 bytes from 8.8.8.8: icmp_seq=5 ttl=58 time=7.95 ms

--- 8.8.8.8 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4006ms
rtt min/avg/max/mdev = 7.343/8.208/9.171/0.703 ms
- Glennie_Beie commented on June 27th 19 at 15:30
: Now try to put ubuntu-desktop, all the idea is needed to successfully boot will be installed automatically - Roger.Erns commented on June 27th 19 at 15:33
: Set, all the same. Now reinstall the system. - Glennie_Beie commented on June 27th 19 at 15:36

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