echo "deb https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list nigel@nigel-VirtualBox:~$ sudo apt-get install apt-transport-https Reading package lists... Done Building dependency tree Reading state information... Done apt-transport-https is already the newest version (1.6.12ubuntu0.1). The following packages were automatically installed and are no longer required: efibootmgr libegl1-mesa libfwup1 libwayland-egl1-mesa linux-headers-5.3.0-46 linux-headers-5.3.0-46-generic linux-image-5.3.0-46-generic linux-modules-5.3.0-46-generic linux-modules-extra-5.3.0-46-generic Use 'sudo apt autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. N: Ignoring file 'syncthing.net' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension nigel@nigel-VirtualBox:~$
WHat can I do to remove this error???
Many thanks for any assistance.