运行 18.04 但仍然收到警告:安全更新......ment Stack 于 2016-08-04 结束

运行 18.04 但仍然收到警告:安全更新......ment Stack 于 2016-08-04 结束

我将 Ubuntu 更新到 18.04.4 LTS,但如果我使用 SSH 登录这台机器,我会收到警告:

WARNING: Security updates for your current Hardware Enablement Stack
ended on 2016-08-04:
 * http://wiki.ubuntu.com/1404_HWE_EOL

To upgrade to a supported (or longer-supported) configuration:

* Upgrade from Ubuntu 14.04 LTS to Ubuntu 16.04 LTS by running:
sudo do-release-upgrade 

OR

* Switch to the current security-supported stack by running:
sudo apt-get install linux-image-generic-lts-xenial linux-generic-lts-xenial

and reboot your system.

当我运行时,sudo do-release-upgrade没有可安装的更新。当我运行时,sudo apt-get install linux-image-generic-lts-xenial linux-generic-lts-xenial我收到以下错误:

$ sudo apt-get install linux-image-generic-lts-xenial linux-generic-lts-xenial
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package linux-image-generic-lts-xenial
E: Unable to locate package linux-generic-lts-xenial

有人能给我指明正确的方向吗?

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.4 LTS
Release:    18.04
Codename:   bionic
$ uname -a
Linux stash-server 5.3.0-46-generic #38~18.04.1-Ubuntu SMP Tue Mar 31 04:17:56 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

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