[dnf/yum] downgrade가 막힐 때 (--allowerasing)

# sudo dnf downgrade openssl-libs
Last metadata expiration check: 0:04:36 ago on Sun 19 Oct 2025 11:46:26 AM KST.
Error:
 Problem: problem with installed package openssl-fips-provider-1:3.5.1-2.el9.x86_64
  - package openssl-fips-provider-1:3.5.1-2.el9.x86_64 from @System requires openssl-libs(x86-64) = 1:3.5.1-2.el9, but none of the providers can be installed
  - package openssl-fips-provider-1:3.5.1-2.el9.x86_64 from baseos requires openssl-libs(x86-64) = 1:3.5.1-2.el9, but none of the providers can be installed
  - package openssl-fips-provider-1:3.5.1-3.el9.x86_64 from baseos requires openssl-libs(x86-64) = 1:3.5.1-3.el9, but none of the providers can be installed
  - package openssl-fips-provider-1:3.5.1-5.el9.x86_64 from baseos requires openssl-libs(x86-64) = 1:3.5.1-5.el9, but none of the providers can be installed
  - cannot install both openssl-libs-1:3.5.1-1.el9.x86_64 from baseos and openssl-libs-1:3.5.1-2.el9.x86_64 from @System
  - cannot install both openssl-libs-1:3.5.1-2.el9.x86_64 from baseos and openssl-libs-1:3.5.1-1.el9.x86_64 from baseos
  - cannot install both openssl-libs-1:3.5.1-3.el9.x86_64 from baseos and openssl-libs-1:3.5.1-1.el9.x86_64 from baseos
  - cannot install both openssl-libs-1:3.5.1-5.el9.x86_64 from baseos and openssl-libs-1:3.5.1-1.el9.x86_64 from baseos
  - cannot install the best candidate for the job
(try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)

# sudo dnf downgrade openssl-libs --allowerasing
Last metadata expiration check: 0:07:15 ago on Sun 19 Oct 2025 11:46:26 AM KST.
Dependencies resolved.
========================================================================================
 Package                Architecture     Version                 Repository        Size
========================================================================================
Downgrading:
 openssl                x86_64           1:3.5.0-4.el9           baseos           1.5 M
 openssl-libs           x86_64           1:3.5.0-4.el9           baseos           2.7 M

Transaction Summary
========================================================================================
Downgrade  2 Packages

Total download size: 4.1 M
Is this ok [y/N]: y
Downloading Packages:
(1/2): openssl-3.5.0-4.el9.x86_64.rpm                   1.4 MB/s | 1.5 MB     00:01
(2/2): openssl-libs-3.5.0-4.el9.x86_64.rpm              2.0 MB/s | 2.7 MB     00:01
----------------------------------------------------------------------------------------
Total                                                   2.1 MB/s | 4.1 MB     00:01
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                                1/1
  Downgrading      : openssl-libs-1:3.5.0-4.el9.x86_64                              1/4
  Downgrading      : openssl-1:3.5.0-4.el9.x86_64                                   2/4
  Cleanup          : openssl-1:3.5.1-1.el9.x86_64                                   3/4
  Cleanup          : openssl-libs-1:3.5.1-1.el9.x86_64                              4/4
  Running scriptlet: openssl-libs-1:3.5.1-1.el9.x86_64                              4/4
  Verifying        : openssl-1:3.5.0-4.el9.x86_64                                   1/4
  Verifying        : openssl-1:3.5.1-1.el9.x86_64                                   2/4
  Verifying        : openssl-libs-1:3.5.0-4.el9.x86_64                              3/4
  Verifying        : openssl-libs-1:3.5.1-1.el9.x86_64                              4/4

Downgraded:
  openssl-1:3.5.0-4.el9.x86_64             openssl-libs-1:3.5.0-4.el9.x86_64

Complete!