I ran the checksum for the current ISO file of the full Xubuntu desktop version on the Xubuntu website, and the checksum appears to be valid.
https://mirror.us.leaseweb.net/ubuntu-cdimage/xubuntu/releas...
[user@host]$ ls
SHA256SUMS SHA256SUMS.gpg xubuntu-24.04.3-desktop-amd64.iso
[user@host]$ cat SHA256SUMS
b61e083d8a5ab003bad6ef7ea31ec21d7bfdf19b99d75987ab3fa3bbe85ec1bf *xubuntu-24.04.3-desktop-amd64.iso
[user@host]$ sha256sum xubuntu-24.04.3-desktop-amd64.iso
b61e083d8a5ab003bad6ef7ea31ec21d7bfdf19b99d75987ab3fa3bbe85ec1bf xubuntu-24.04.3-desktop-amd64.iso
[user@host]$ echo $?
0