Reinstalling Linux boot-file packages

You can update and reinstall boot-file packages.

About this task

If Linux boot files were corrupted, or if boot-file signatures are invalid, for example due to an expired secure boot certificate, proceed as follows:

Update the relevant packages to their latest versions.
If the package is already at the latest version, reinstall the package.

Procedure

Red Hat® Enterprise Linux
To update packages to their latest versions, issue:
```
# dnf update kernel-core s390utils-core
```
To reinstall packages, issue:
```
# dnf reinstall kernel-core s390utils-core
```
SUSE Linux Enterprise Server
To update packages to their latest version, issue:
```
# zypper update kernel-default s390-tools
```
To reinstall packages, issue:
```
# zypper install -f kernel-default s390-tools
# grub2-install
```

Ubuntu

To update packages to their latest versions, issue:

# apt update
# apt upgrade linux-image-generic s390-tools

To reinstall packages, issue:

# apt install --reinstall linux-image-$(uname -r) s390-tools-signed