gthumb-dev 3:3.8.0-2.1build1 (riscv64 binary) in ubuntu focal

 gThumb is an advanced image viewer and browser. It has many useful
 features, such as filesystem browsing, slide show, image catalogs, web
 album creation, camera import, image CD burning, batch file operations and
 quick image editing features like transformation and color manipulation.
 .
 It's designed for GNOME desktop environment and uses its platform. For
 camera import feature, the gPhoto2 library is used.
 .
 This package contains the files needed to develop third-party extensions.