Ma quelli che ti ho riportato non sono errori.
Comunque:
opkg info htop
Package: htop
Version: 2.2.0-1
Depends: libc, librt, libpthread, libncurses
Status: unknown ok not-installed
Section: admin
Architecture: arm_cortex-a9_neon
Size: 55523
Filename: htop_2.2.0-1_arm_cortex-a9_neon.ipk
Description: Htop is an ncursed-based process viewer similar to top, but
it allows to scroll the list vertically and horizontally to
see all processes and their full command lines.
opkg info libncurses
Package: libncurses
Version: 6.1-1
Depends: libc, librt, libpthread, terminfo
Provides: libncursesw
Status: install ok installed
Section: libs
Architecture: arm_cortex-a9_neon
Size: 151037
Filename: libncurses_6.1-1_arm_cortex-a9_neon.ipk
Description: Terminal handling library (Unicode)
Installed-Time: 1579649989
Ed è correttamente presente nel repo.
Prova con:
opkg update
opkg install libncurses