pi@raspberrypi:/usr/local/src/signal-desktop-pi4 $ sh ./install.sh
installing apt dependencies...
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package python-is-python3
E: Unable to locate package libcrypto++8
E: Couldn't find any package by regex 'libcrypto++8'
pi@raspberrypi:/usr/local/src/signal-desktop-pi4 $ sh ./install.sh installing apt dependencies... Reading package lists... Done Building dependency tree
Reading state information... Done E: Unable to locate package python-is-python3 E: Unable to locate package libcrypto++8 E: Couldn't find any package by regex 'libcrypto++8'