It looks like you removed /usr/bin/chimerax by hand before removing the package.  If you add the symbolic link back with "sudo ln -s ../../usr/lib/ucsf-chimerax/bin/ChimeraX /usr/bin/chimerax", it should work.  That is the symbolic link for Ubuntu.  For RHEL derived systems, like Rocky and AlmaLinux, it would be ../libexec/UCSF-ChimeraX/bin/ChimeraX.     -- Greg On 1/6/2025 2:25 AM, saverio via ChimeraX-users wrote:

Hi, surely for my errors in uninstalling the previous version , I'm receiving the following:

$ sudo apt remove --purge ucsf-chimerax Reading package lists... Done Building dependency tree... Done Reading state information... Done The following packages were automatically installed and are no longer required: libgdk-pixbuf-xlib-2.0-0 libgdk-pixbuf2.0-0 libosmesa6 libxcb-cursor0 Use 'sudo apt autoremove' to remove them. The following packages will be REMOVED: ucsf-chimerax* 0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] (Reading database ... 524167 files and directories currently installed.) Removing ucsf-chimerax (1.9ubuntu24.04) ... Deregister desktop menu and associated mime types /var/lib/dpkg/info/ucsf-chimerax.prerm: 4: chimerax: not found dpkg: error processing package ucsf-chimerax (--remove): installed ucsf-chimerax package pre-removal script subprocess returned error exit status 127 dpkg: too many errors, stopping Errors were encountered while processing: ucsf-chimerax Processing was halted because there were too many errors. E: Sub-process /usr/bin/dpkg returned an error code (1)

$ dpkg --get-selections | grep ucsf ucsf-chimerax install

$ chimerax chimerax: command not found Any suggestions to recover?

Thanks.

Saverio

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