I have purchased a Rock pi 4b and a samsung evo 64GB sd card. After booting ubuntu from image , I started installing lxde desktop. But i am getting error .
W: Some index files failed to download. They have been ignored , or old ones used instead
E: IO Error saving source cache
E: The package lists or status file could not be parsed or opened.
One more question. Please see the image attached. I am using 64 GB sd card and putted ubuntu server os image. but how come it is not showing this image. I am confused??