1、neon毕竟是基于ubuntu的，软件版本不是一般的老，octave官方仓库是6.4的，有些函数和插件竟然不支持了，只能安装8.2的，可以使用discover安装，那速度嘿嘿，谁用谁知道啊
2、配置国内的源，使用上交大的源，先感谢上交大的辛苦付出。
https://mirror.sjtu.edu.cn/docs/flathub
进入后依次执行：
wget https://mirror.sjtu.edu.cn/flathub/flathub.gpg
sudo flatpak remote-modify --gpg-import=flathub.gpg flathub
sudo flatpak remote-modify flathub --url=https://mirror.sjtu.edu.cn/flathub
否则会有
sudo flatpak remote-add kde https://mirror.sjtu.edu.cn/flathub error: Signature made 2023年06月20日 星期二 19时06分05秒 using RSA key ID 562702E9E3ED7EE8 Can't check signature: public key not found
3、安装：
sudo flatpak install octave Looking for matches… Found ref ‘app/org.octave.Octave/x86_64/stable’ in remote ‘flathub’ (system). Use this ref? [Y/n]: y Required runtime for org.octave.Octave/x86_64/stable (runtime/org.kde.Sdk/x86_64/5.15-22.08) found in remote flathub Do you want to install it? [Y/n]: y org.octave.Octave permissions: ipc network pulseaudio wayland x11 dri file access [1] dbus access [2] [1] host, xdg-config/kdeglobals:ro [2] com.canonical.AppMenu.Registrar, org.freedesktop.Flatpak, org.kde.KGlobalSettings, ID Branch Op Remote Download 1. [✓] org.kde.KStyle.Adwaita 5.15-22.08 i flathub 6.6 MB / 6.6 MB ID Branch Op Remote Download 1. [✓] org.kde.KStyle.Adwaita 5.15-22.08 i flathub 6.6 MB / 6.6 MB 2. [✓] org.kde.Sdk 5.15-22.08 i flathub 837.6 MB / 714.7 MB 3. [✓] org.octave.Octave stable i flathub 159.4 MB / 144.1 MB Installation complete.
如果用默认的源，就这么说就从来没有成功过，也许是软件包太大了，也许是网络阻塞吧。
赶紧试试吧