在Ubuntu上安装ToDesk后无法连接通常是由于Wayland协议不兼容导致的：
需要做到是关闭Wayland并启用X11:
1、解决todesk无法远程问题
打开终端（Ctrl+Alt+T）

sudo vim /etc/gdm3/custom.conf

找到以下行并删除前面的注释符号#:

#WaylandEnable=false

重启ubuntu系统

sudo reboot

2、解决重启后ubuntu页面红色/高对比对情况。有提供问题是将WaylandEnable=false注释掉，但是这样todesk又无法使用。
上述可以通过更新显卡驱动解决问题。

sudo ubuntu-drivers devices

输出类似适合的显卡驱动：

== /sys/devices/pci0000:d4/0000:d4:00.0/0000:d5:00.0 ==
modalias : pci:v000010DEd000024B0sv00001028sd000014ADbc03sc00i00
vendor   : NVIDIA Corporation
model    : GA104GL [RTX A4000]
driver   : nvidia-driver-570 - distro non-free
driver   : nvidia-driver-470 - distro non-free
driver   : nvidia-driver-580-server-open - distro non-free
driver   : nvidia-driver-570-open - distro non-free
driver   : nvidia-driver-545-open - distro non-free
driver   : nvidia-driver-570-server - distro non-free
driver   : nvidia-driver-470-server - distro non-free
driver   : nvidia-driver-545 - distro non-free
driver   : nvidia-driver-535-server - distro non-free
driver   : nvidia-driver-580-server - distro non-free
driver   : nvidia-driver-535 - distro non-free
driver   : nvidia-driver-580 - distro non-free
driver   : nvidia-driver-535-open - distro non-free
driver   : nvidia-driver-535-server-open - distro non-free
driver   : nvidia-driver-580-open - distro non-free recommended
driver   : nvidia-driver-570-server-open - distro non-free
driver   : xserver-xorg-video-nouveau - distro free builtin

选择合适的驱动进行安装即可：

sudo apt install nvidia-driver-570
sudo reboot

通过上述就可解决相应问题了！！！！！