The Syncthing-gtk, GTK3-based GUI and Syncthing indicators have been removed from the Ubuntu 20.10 Groovy main repository due to a dependency on the old Python library.
For those who stick to this program, the Python3 port is currently in progress. It is now the main repository for the following Ubuntu 21.04 Hirsute Hippo. You can also download and install the package on Ubuntu 20.10.
1. Download first
.deb Package from the link below:
Ubuntu 21.04 is still under active development, so the packages have been updated (may be updated).Please check Package construction page If the previous button does not work.
2. Once you get the package, open it
terminal (Ctrl + Alt + T) and run the command to install:
sudo apt install ./Download/syncthing-gtk_0.9.4.4+ds+git20200927+d09a2ef-3_all.deb
Tip: If you want to enter the command manually, press Tab after typing
syncthing-gtk Autocomplete the file name in a terminal window.
Once installed, launch the software from the system application menu and enjoy!
(Optional) To remove the package, just run the command in your terminal.
sudo apt remove syncthing-gtk