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 Since that did not work, I suggest you try some of the other suggestions in that posting about changing the permissions on files related to _apt..  If you are not a system administrator, then perhaps one could help you out.  It reads to me like different fixes worked for various people depending upon their system.  You could check to see if there are any Ubuntu system updates available as that might help, but I don’t see any reports of that providing a fix.  I would expect what you list to happen with any binary RPM you download and try to install, i.e., I don’t see this as an issue with the freesurfer installer. - R.

On Aug 16, 2023, at 06:19, Praise Matsekete <MTSPRA001@myuct.ac.za> wrote:        External Email - Use Caution        Good day,Kindly find attached a screenshot of what I tried to do in the terminal as well.Kind regards,Praise From: Praise Matsekete <MTSPRA001@myuct.ac.za>Sent: Wednesday, 16 August 2023 12:08To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>Subject: Re: [Freesurfer] Trouble installing Freesurfer 7.4.1 on Ubuntu 22.04.2 LTS Good day,Thank you so much for the help. I tried to "chmod 777" the .deb file before  installing it. However, I am still experiencing the same issue.Kindly find attached a copy of the text from the terminal after I tried this.Kind regards,Praise MatseketeFrom: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> on behalf of fsbuild <fsbuild@contbay.com>Sent: Tuesday, 15 August 2023 21:48To: freesurfer@nmr.mgh.harvard.edu <freesurfer@nmr.mgh.harvard.edu>Cc: Praise Matsekete <MTSPRA001@myuct.ac.za>Subject: Re: [Freesurfer] Trouble installing Freesurfer 7.4.1 on Ubuntu 22.04.2 LTS CAUTION: This email originated outside the UCT network. Do not click any links or open attachments unless you know and trust the source.        External Email - Use Caution        Hello Praise,This post,MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to behttps://askubuntu.com/questions/908800/what-does-this-apt-error-message-down... indicates it is from a permission problem with _apt on the system (which may have been an Ubuntu bug/issue).    One of the more innocuous fixes suggested there is to down protect or “chmod 777” the .deb package and then try to install it.  Other fixes involve changing the permissions of system files.  I have not seen that error testing the install in a newly made Ubuntu 22 docker container.- R.On Aug 15, 2023, at 10:43, Praise Matsekete <MTSPRA001@myuct.ac.za> wrote: Download is performed unsandboxed as rootDisclaimer - University of Cape Town This email is subject to UCT policies and email disclaimer published on our website at http://secure-web.cisco.com/1n1CU5pgJva0i88ZdZvGUVVJvFn05Or9gojbkdZVXUZHyo4u... or obtainable from +27 21 650 9111. If this email is not related to the business of UCT, it is sent by the sender in an individual capacity. Please report security incidents or abuse via https://secure-web.cisco.com/1ZM9iFYqL-twUClMROcbvwPaSPzsAlYMRElsr6iQpdf2UIV... from 2023-08-16 12-04-10.png>_______________________________________________Freesurfer mailing listFreesurfer@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer