The kernel image that caused the issue (version 4.15.0-24) was released as an update to Ubuntu 18.04 on July 4th, and was already removed from the repository archives at the time I'm posting this article.A fix for this issue was already released, but the updated package is currently only available in the Ubuntu 18.04 proposed repositories - hopefully it will make it into the main repositories soon.An user mentions that booting to previous kernels apparently doesn't solve this, though that is probably a different issue.Until the package containing the fix is promoted from the Proposed repository, if you're affected by this bug (which seems to be entropy-related) you can speed up the boot process by "", mentioned Oliver Grawert in a Google+ reply This bug does not affect all systems. In fact, I'm running this kernel right now and I'm not noticing any increased boot times on my Ubuntu 18.04 desktop: