...
> Can I remove all these without causing any problems with the Fedora-29 
> or rescue options in the grub menu?

good question !

cause to me it's not clear on what
1. architecture you are (x86_64 or i686) ?
see your first post cit.: "...libcap-2.26-5.fc30.i686 needs..." => "i686" !

2. kernel you are ?
uname -a (show us the answers of this two questions)

3. fedora version you are ?
your run of "dnf list extras" shows that you are somehow/partly on F30. 
But the main problem was - if I'm right - that the upgrade F29 => F30 hasn't 
worked !

according to the answer of my question 2. you need to be carefull if you remove 
the wrong kmod-nvidia for your running kernel !

I guess you could 
- remove all packages lower than F29 if you are currently on F29
- remove all i686 packages if you are on x86_64, with one exception - at least 
it was true in the past -
(I guess it was named- don't know -) "glib-something.i686 !
you are on the save side if you exclude all packages with "lib" in it's name

sudo dnf remove *.i686 --exclude=*lib* ... something like that...

general:
dnf history shows you what you have done with packages (install, upgrade, 
remove) in the past.
see man dnf and search for "history"

what I'm after is "dnf history undo <number>", means you are able to undo a 
remove in the sense of re-install.
But - I guess - you can't undo a package from F28 repo if you are currently on 
F30 repo (see answer question 3.)

If it would be clear on what Fedora version you are I would do the following 
see [**]

- df -f (space before cleanage, just for the record)
- clean up the above mess (remove i686 packages and all packages lower then F29)
- sudo dnf clean all (delete the cache, means: to be downloaded again later, 
but maybe fewer packages
- sudo dnf distro-sync (brings the box to a clean state on the current fedora 
version)
- maybe a subsequent sudo dnf autoremove (handle with care !!!!!)
- df -h (space after cleanage)
- at least THE upgrade:

1. sudo dnf install dnf-plugin-system-upgrade (if anymore installed since 
cleanage)
2. sudo dnf system-upgrade download --refresh --releasever=30 
--setopt='module_platform_id=platform:f30' --allowerasing

command in 2. is ONE line (sudo ... allowerasing) !

3. sudo dnf system-upgrade reboot
4. sudo dnf system-upgrade clean 
Does this clean the upgrade log's too ???
then 4. later until all is correct !

specials:
5. sudo dnf install rpmconf
6. sudo rpmconf -a (resets all configs under /etc/ to it's default state, 
handle with care !!!!!, maybe take a backup BEFORE)
if you haven't edit the config file rpmconf is working on, i or y is a save 
option (you will be asked)
 
7. sudo touch /.autorelabel (selinux label to defaults)
8. reboot
9. boot errors ?:
dmesg|grep -iEw 
'bad|bug|conflict|corrupted|error|fail|failed|fault|fatal|invalid|Lock|NULL|segfault|stack|trace|warn'

command in 9. is ONE line (dmesg ... warn') !

ALLWAYS think twice before hitting the "y"-key while cleaning with dnf 
remove/distro-sync/autoremove !

[**]
apart from doing a new install and removing all the old cruft, cause so much 
work for an so old box !
=> fc26  from above "mozjs24.x86_64                            24.2.0-11.fc26 
@@commandline"




  
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