Issue installing on Ubuntu 18.04

[chranmat]

When trying to install on Ubuntu 18.04 i get the following error during the install process. Installation for KVM was used.

Installing OpenNebula packages retry 1 retry 2 retry 3 FAILED
apt-get -q -y install opennebula opennebula-sunstone opennebula-gate opennebula-flow
--- STDERR ---
E: Failed to fetch https://downloads.opennebula.io/repo/5.12/Ubuntu/18.04/pool/opennebula/opennebula-rubygems_5.12.0.1-1.ce_all.deb Hash Sum mismatch
Hashes of expected file:
- SHA256:2b07495f355f68ace90f4835e0b739e95b3399125eefea3999cd4cc91efb9118
- SHA1:172863a12c3ba9100bbb4b93d580f6a78bd2a936 [weak]
- MD5Sum:bcbc127f9bc9b0eb9fde891431e852c0 [weak]
- Filesize:16571256 [weak]
Hashes of received file:
- SHA256:f3e8716a395fadc7b551f7e37bd9e076a7aec8059f9d5978fcc146c83f0bbc2c
- SHA1:48f50169f830336788a68ba981a5ef8b11157ab2 [weak]
- MD5Sum:5cb323bb63ab4467415695e5e0d9c7e5 [weak]
- Filesize:16571256 [weak]
Last modification reported: Wed, 15 Jul 2020 17:40:57 +0000

[vholer]

Aren't you behind transparent proxy, which could malform the content?
Can you check what's in the downloaded file?
Is it really deb? What metadata does it have.