The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 ESM: squashfs-tools 1:4.3-3ubuntu2.16.04.3+esm1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5078-2
https://ubuntu.com/security/notices/USN-5078-1
CVE-2021-40153, CVE-2021-41072
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