How to change the screen resolution?
I type the command
rdesktop "server ip"
but the screen does not appear large.
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I'd suggest that you consider a graphical tool such as Remmina (used to be called GRDC) : http://remmina.sourceforge.net/, which is available in the repositories.
sudo apt-get install remmina remmina-plugin-rdp remmina-plugin-vnc
It features easy to use drop downs and sliders for remote screen resolution, supporting multiple monitors and more.
It also supports VNC and SSH tunnelling, making it a one-stop-shop for all your most likely remote desktop connection needs. Finally, a handy gnome-panel applet makes connecting to your remote desktops a simple point and click experience.
Screenshots here : http://remmina.sourceforge.net/screenshots.shtml
I had the problem on my Ubuntu 20.10 notebook that my screen has 1920x1080 but only 14 inch, so the dpi is higher on my notebook screen than on the monitor of the remote computer
I could adjust this by using
-g parameter with the DPI option, that is specified via an
rdesktop -g 100%@150 <remote_computer>
100% refer to my screen size and the higher the value after the 1