Before running the install script, make sure your distro specific dependencies listed in the Dependencies section are installed or just run the correct install command.
For installing Aseprite make sure upsprite.sh has execution permissions, simply run ./upsprite and follow any promtps given.
If you want to automate the installation with your own scripts and integrate upsprite, or just quickly run upsprite without prompts, you can run the script with --prebuilt to automatically use the prebuilt skia, --rebuild-skia for automatically removing and rebuilding/redownloading skia and --full for automatically building skia, independent of whether there is a prebuilt package available or not. You can also use the --local-skia flag to use the existing instance of skia, whether it's the prebuilt version or the self-coppiled one. You can't use --rebuild-skia, --full or --prebuilt when using the --local-skia flag.
Just run upsprite.sh with the --uninstall flag.
You will need the following dependencies on Ubuntu/Debian:
sudo apt-get install -y g++ clang libc++-dev libc++abi-dev cmake ninja-build libx11-dev libxcursor-dev libxi-dev libgl1-mesa-dev libfontconfig1-dev
Or use clang-10 packages (or newer) in case that clang in your distribution is older than clang 10.0:
sudo apt-get install -y clang-10 libc++-10-dev libc++abi-10-dev
On Fedora:
sudo dnf install -y gcc-c++ clang libcxx-devel cmake ninja-build libX11-devel libXcursor-devel libXi-devel mesa-libGL-devel fontconfig-devel
On Arch:
sudo pacman -S gcc clang libc++ cmake ninja libx11 libxcursor mesa-libgl fontconfig
On SUSE:
sudo zypper install gcc-c++ clang libc++-devel libc++abi-devel cmake ninja libX11-devel libXcursor-devel libXi-devel Mesa-libGL-devel fontconfig-devel
If you encounter any issues, either try to find the cause from the command line output or submit an issue on the upsprite github repo.