我在 Ubuntu 18.04 LTS 上。我正在运行此内核版本：
root@sintrones-vbox:/usr/src# uname -r
5.4.0-122-generic
在文件夹中usr/src，我有：
root@sintrones-vbox:/usr/src# ls
backport-iwlwifi-8324 linux-headers-4.15.0-189 linux-hwe-5.4-5.4.0 linux-hwe-5.4_5.4.0.orig.tar.gz linux-source-4.15.0.tar.bz2
linux-headers-4.15.0-162 linux-headers-4.15.0-189-generic linux-hwe-5.4_5.4.0-122.138~18.04.1.diff.gz linux-hwe-5.4-headers-5.4.0-122
linux-headers-4.15.0-162-generic linux-headers-5.4.0-122-generic linux-hwe-5.4_5.4.0-122.138~18.04.1.dsc linux-source-4.15.0
有没有办法安装内核版本4.15.0？在我升级之前，它是以前的内核版本。我安装了几个内核：
root@sintrones-abox:/usr/src# apt list --installed | grep linux-image
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
linux-image-4.15.0-162-generic/bionic-updates,bionic-security,now 4.15.0-162.170 amd64 [installed]
linux-image-4.15.0-189-generic/bionic-updates,bionic-security,now 4.15.0-189.200 amd64 [installed,automatic]
linux-image-5.4.0-122-generic/bionic-updates,bionic-security,now 5.4.0-122.138~18.04.1 amd64 [installed,automatic]
linux-image-extra-virtual/bionic-updates,bionic-security,now 4.15.0.189.174 amd64 [installed]
linux-image-generic/bionic-updates,bionic-security,now 4.15.0.189.174 amd64 [installed,automatic]
linux-image-unsigned-5.18.14-051814-generic/now 5.18.14-051814.202207231131 amd64 [installed,local]
问题是我想切换到4.15版本
我已经安装了几个内核：
root@sintrones-abox:/usr/src# apt list --installed | grep linux-image
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
linux-image-4.15.0-162-generic/bionic-updates,bionic-security,now 4.15.0-162.170 amd64 [installed]
linux-image-4.15.0-189-generic/bionic-updates,bionic-security,now 4.15.0-189.200 amd64 [installed,automatic]
linux-image-5.4.0-122-generic/bionic-updates,bionic-security,now 5.4.0-122.138~18.04.1 amd64 [installed,automatic]
linux-image-extra-virtual/bionic-updates,bionic-security,now 4.15.0.189.174 amd64 [installed]
linux-image-generic/bionic-updates,bionic-security,now 4.15.0.189.174 amd64 [installed,automatic]
linux-image-unsigned-5.18.14-051814-generic/now 5.18.14-051814.202207231131 amd64 [installed,local]
问题是我想切换到4.15版本