Binary package “xpaint” in ubuntu bionic

simple paint program for X

 XPaint is suitable for producing simple graphics. It does offer some
 advanced features such as image processing functions and gradient
 In the C Script Editor of XPaint, the External editor in the File menu
 will invoke x-terminal-emulator -e sensible-editor.
 The gv package will be needed for PDF/PS reading, netpbm will be needed
 for external conversion, lpr for printing.