The Ubuntu team announced the release of Ubuntu 16.04.7 and 18.04.5. These releases offer updated media installations with package fixes and not completely new versions of the distribution.
New ISOs include fixes for the recent Boothole GRUB boot loader problem: 
“As with point release 16.04.6, 16.04.7 is a security release intended to provide updated installation media that protects new installations from 2 vulnerabilities newly discovered in GRUB 2 vulnerabilities (USN-4432-1). ”
Detailed information on USN-4432-1 can be found here find here.
"The new ISO images for information 18.04.5 are available for most community editions of Ubuntu, however only Ubuntu and Ubuntu Kylin have version 16.04.7 as this version is no longer covered by the three years of support that most community editions offer.
More information can be found in the announcements of the new releases
16.04.7 and 18.04.5.
Download
- ubuntu-16.04.7-desktop-amd64.iso (1,619MB, SHA256, signature, torrent sites),
- ubuntukylin-16.04.7-desktop-amd64.iso (1,668MB, SHA256, signature, torrent sites),
- ubuntu-18.04.5-desktop-amd64.iso (2,091MB, SHA256, signature, torrent sites),
- kubuntu-18.04.5-desktop-amd64.iso (1,908MB, SHA256, signature, torrent sites),
- lubuntu-18.04.5-desktop-amd64.iso (1,145MB, SHA256, signature, torrent sites),
- ubuntukylin-18.04.5-desktop-amd64.iso (1,788MB, SHA256, signature, torrent sites),
- ubuntu-mate-18.04.5-desktop-amd64.iso (1,964MB, SHA256, signature, torrent sites),
- ubuntu-budgie-18.04.5-desktop-amd64.iso (1,655MB, SHA256, signature, torrent sites),
- xubuntu-18.04.5-desktop-amd64.iso (1,490MB, SHA256, signature, torrent sites).
