Only had E.OS 5.1 Hera a few days and have encountered 2 issues which I cannot resolve and can be best explained by the two uploaded screenshots. The 1st - this dialog appears whenever I open the app repository and only started to appear after I downloaded via terminal the repositories required for flatpak and sideloading. At the same time I installed FreeFileSync from the online flathub repository.The dialog mentions the possibility of manually downloaded repos as being a possible cause but would like to check with other users. The 2nd - I am endeavouring to install the repos necessary for the installation of Timeshift and have been following a procedure shown in an online tutorial. Despite having used the precise same syntax as the tutorial shows the response is as shown. I would truly appreciate any assistance that any one can offer. Many thanks - Bob Deb
Your first issue appears to be an issue connecting to the Ubuntu archives at
If that's the issue perhaps its temporary.
I can connect to the server just fine.
In case it is related to other repositories configured, can you run the following command from a terminal and show the output.
This will show your system's configured repositories.
grep -r --include '*.list' '^deb ' /etc/apt/sources.list /etc/apt/sources.list.d/
For your second problem, the command
add-apt-repository is provided by the
software-properties-common package so you just need to install that.
sudo apt -y install software-properties-common