Stable kernels 5.4.2, 5.3.15, and 4.19.88

Greg Kroah-Hartman has announced the release of the 5.4.2, 5.3.15,and 4.19.88 stable kernels. They contain arelatively large collection of important fixes throughout the tree; users of thosekernel series should upgrade.

[Update: A bit later, the 4.14.158,4.9.206, and 4.4.206 stable kernels were also released.]