Well, download "Dictionary, encyclopedia, music, videos, etc.".
https://www.kiwix.org looks great. It allows to read, among other resources,
Wikipedia offline. However, on Trisquel 8:
$ ./kiwix-desktop_x86_64_2.0.4.appimage
./kiwix-desktop_x86_64_2.0.4.appimage: /lib/x86_64-linux-gnu/libm.so.6:
version `GLIBC_2.27' not found (required by
/tmp/.mount_kiwix-CPm1Ce/usr/bin/../lib/libQt5WebEngineCore.so.5)
./kiwix-desktop_x86_64_2.0.4.appimage: /lib/x86_64-linux-gnu/libz.so.1:
version `ZLIB_1.2.9' not found (required by
/tmp/.mount_kiwix-CPm1Ce/usr/bin/../lib/libpng16.so.16)
./kiwix-desktop_x86_64_2.0.4.appimage: /lib/x86_64-linux-gnu/libm.so.6:
version `GLIBC_2.27' not found (required by
/tmp/.mount_kiwix-CPm1Ce/usr/bin/../lib/libavcodec.so.57)
./kiwix-desktop_x86_64_2.0.4.appimage: /lib/x86_64-linux-gnu/libc.so.6:
version `GLIBC_2.27' not found (required by
/tmp/.mount_kiwix-CPm1Ce/usr/bin/../lib/libavformat.so.57)
./kiwix-desktop_x86_64_2.0.4.appimage: /lib/x86_64-linux-gnu/libc.so.6:
version `GLIBC_2.25' not found (required by
/tmp/.mount_kiwix-CPm1Ce/usr/bin/../lib/libgnutls.so.30)
./kiwix-desktop_x86_64_2.0.4.appimage: /lib/x86_64-linux-gnu/libc.so.6:
version `GLIBC_2.25' not found (required by
/tmp/.mount_kiwix-CPm1Ce/usr/bin/../lib/libsystemd.so.0)
./kiwix-desktop_x86_64_2.0.4.appimage: /lib/x86_64-linux-gnu/libc.so.6:
version `GLIBC_2.27' not found (required by
/tmp/.mount_kiwix-CPm1Ce/usr/bin/../lib/libsystemd.so.0)
./kiwix-desktop_x86_64_2.0.4.appimage: /lib/x86_64-linux-gnu/libc.so.6:
version `GLIBC_2.27' not found (required by
/tmp/.mount_kiwix-CPm1Ce/usr/bin/../lib/libgssapi_krb5.so.2)
I believe it would work on Trisquel 9.
For dictionaries, see
https://askubuntu.com/questions/170775/offline-dictionary-with-pronunciation-and-usages
