- Remove all unneeded packages
# zypper packages --unneeded
> Loading repository data...
> Warning: Repository 'openSUSE-Leap-42.2-Update-Non-Oss' appears to be outdated. Consider using a different mirror or server.
> Reading installed packages...
> No packages found.

- zypper dup installs 'ctan-latinmodern-fonts'
> # zypper dup
> Warning: You are about to do a distribution upgrade with all enabled repositories. Make sure these repositories are compatible before you continue. See 'man zypper' for more information about this command.
> Loading repository data...
> Warning: Repository 'openSUSE-Leap-42.2-Update-Non-Oss' appears to be outdated. Consider using a different mirror or server.
> Reading installed packages...
> Computing distribution upgrade...
> 
> The following item is locked and will not be changed by any action:
>  Available:
>   flash-player
> 
> The following NEW package is going to be installed:
>   ctan-latinmodern-fonts
> 
> 1 new package to install.
> Overall download size: 1.4 MiB. Already cached: 0 B. After the operation, additional 3.9 MiB will be used.
> Continue? [y/n/? shows all options] (y): 
> Retrieving package ctan-latinmodern-fonts-2.004-14.1.noarch                                                                                                                   (1/1),   1.4 MiB (  3.9 MiB unpacked)
> Retrieving: ctan-latinmodern-fonts-2.004-14.1.noarch.rpm ....................................................................................................................................................[done]
> Checking for file conflicts: ................................................................................................................................................................................[done]
> (1/1) Installing: ctan-latinmodern-fonts-2.004-14.1.noarch ..................................................................................................................................................[done]
> Running: ctan-latinmodern-fonts-2.004-14.1-reconfigure-fonts  (ctan-latinmodern-fonts, /var/adm/update-scripts)
> Running: ctan-latinmodern-fonts-2.004-14.1-reconfigure-fonts  (ctan-latinmodern-fonts, /var/adm/update-scripts) .............................................................................................[done]
> # zypper packages --unneeded
> Loading repository data...
> Warning: Repository 'openSUSE-Leap-42.2-Update-Non-Oss' appears to be outdated. Consider using a different mirror or server.
> Reading installed packages...
> No packages found.

- zypper dup replaces (needed) 'ctan-latinmodern-fonts' with (unneeded)
'texlive-lm-fonts'
> # zypper dup
> Warning: You are about to do a distribution upgrade with all enabled repositories. Make sure these repositories are compatible before you continue. See 'man zypper' for more information about this command.
> Loading repository data...
> Warning: Repository 'openSUSE-Leap-42.2-Update-Non-Oss' appears to be outdated. Consider using a different mirror or server.
> Reading installed packages...
> Computing distribution upgrade...
> 
> The following item is locked and will not be changed by any action:
>  Available:
>   flash-player
> 
> The following NEW package is going to be installed:
>   texlive-lm-fonts
> 
> The following package is going to be REMOVED:
>   ctan-latinmodern-fonts
> 
> 1 new package to install, 1 to remove.
> Overall download size: 10.5 MiB. Already cached: 0 B. After the operation, additional 12.0 MiB will be used.
> Continue? [y/n/? shows all options] (y): 
> Retrieving package texlive-lm-fonts-2015.104.2.004svn28119-19.15.noarch                                                                                                       (1/1),  10.5 MiB ( 15.8 MiB unpacked)
> Retrieving: texlive-lm-fonts-2015.104.2.004svn28119-19.15.noarch.rpm ...........................................................................................................................[done (10.6 MiB/s)]
> Checking for file conflicts: ................................................................................................................................................................................[done]
> (1/1) Installing: texlive-lm-fonts-2015.104.2.004svn28119-19.15.noarch ......................................................................................................................................[done]
> # zypper packages --unneeded
> Loading repository data...
> Warning: Repository 'openSUSE-Leap-42.2-Update-Non-Oss' appears to be outdated. Consider using a different mirror or server.
> Reading installed packages...
> S | Repository      | Name             | Version                      | Arch  
> --+-----------------+------------------+------------------------------+-------
> i | openSUSE-42.2-0 | texlive-lm-fonts | 2015.104.2.004svn28119-19.15 | noarch