hi,
that unit has 1GiB RAM, more than enough to run ubuntu server.
and gl-inet claims to support it for your router
https://www.gl-inet.com/products/gl-mv1000/
https://github.com/gl-inet/mv1000-ubuntu-image
https://forum.gl-inet.com/t/ubuntu-on-brume/10087
fwiw, i run ubuntu server headless on my raspberry pi zero, which has only 512MiB.
and if i remember correctly, i have run webmin on it.
so if you have an extra router and like to thinker, go for it, see how far you get!
thinking + tinkering = thinkering