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Tag : kernel  
Link: πŸ” See Original Answer on Ask Ubuntu πŸ”—

URL: https://askubuntu.com/q/843198
Title: What are Kernel Version number components (w.x.yy-zzz) called?
ID: /2016/10/29/What-are-Kernel-Version-number-components-_w.x.yy-zzz_-called_
Created: October 29, 2016    Edited:  January 5, 2022
Upload: November 24, 2022    Layout:  post
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Kernel Version . Major Revision . Minor Revision - Patch

Using w.xx.y-zzz and looking at the fourth file listed /boot/vmlinuz-4.4.0-45 we can say:

If someone is using 4.8.0, which Ubuntu 16.10 ships with, and encounters screen flickering they might say β€œI used the previous version 4.4.0-45” (which Ubuntu 16.04 uses) to fix the problem.

In layman’s terms, this is correct but technically it was a downgrade four major revision levels (4.8.y-z) to (4.4.y-z). Technically speaking, to move from kernel version 4.8 to a previous kernel version it would have to be 3.2 or 3.13 using the file listing shown in the OP.

Segment name changes after Kernel 3.0

The above definitions come from: (Kernel Version Numbering) published May 9, 2006 but are now obsolete.

As the duplicate comment link (What does the fourth number in the release version mean?) states, the new names are:

<base kernel version>.<ABI number>.<upload number>-<flavour>

The proposed duplicate appears to be wrong because the second segment in the kernel version number seems to have nothing to do with ABI. In the other answer posted in this thread the fourth segment is tied to ABI but that doesn’t seem right either. Here’s the top of the list of ABI changes from (Linux Kernel ABI Timeline):

                ----- Symbols -----
Version	Date    Added Removed Total
4.8.1	2016-10-07	141	50	1470
4.7.2	2016-08-20	170	42	881
4.6.1	2016-06-01	159	52	924
4.5.6	2016-06-01	146	41	994
4.4.5	2016-03-10	87	40	994
4.3.6	2016-02-20	166	51	1231
4.2.8	2015-12-15	213	75	1768
4.1.19	2016-03-05	204	88	1760
4.0.9	2015-07-21	159	53	822
3.19.8	2015-05-11	207	44	1146
3.18.28	2016-03-05	147	56	867
3.17.8	2015-01-08	165	46	688
3.16.7	2014-10-30	155	55	943
3.15.10	2014-08-14	129	98	1051
3.14.64	2016-03-10	279	91	1019
3.13.11	2014-04-23	140	99	822
3.12.56	2016-03-04	171	77	994

ABI number

From wiki.ubuntu we learn:

ABI stands for Application Binary Interface. For the kernel, this
boils down to the exported functions that modules (AKA drivers) can
use to do things in kernel space. Most of these exported functions are
available directly from the kernel (vmlinux), but a good portion is
also exported from other modules. These functions allow modules to
make use of subsystems in the kernel for memory management, device
interfaces, filesystems (VFS), networking stacks, etc.

Summary of Linux Kernel Version Numbering

From perhaps the most definitive source (wikipedia.org - Linux Kernel Version Numbering) we learn:

The Linux kernel has had three different numbering schemes. To summarize:

⇧ Screen crash in Lubuntu and Xubuntu both but works fine with Windows Xp Start script on system startup (Ubuntu 16.04.1)  β‡©