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The only Fedora 29 specific instructions that I found are at this link:
https://www.if-not-true-then-false.com/2010/install-virtualbox-guest-additions-on-fedora-centos-red-hat-rhel/

Since that link is apparently focused on guest additions, I decided to ignore it.

A year ago, I successfully installed VirtualBox in Fedora 26 by following instructions that were similar to the following link: https://www.if-not-true-then-false.com/2010/install-virtualbox-with-yum-on-fedora-centos-red-hat-rhel/

Since I couldn't find corresponding instructions specifically for Fedora 29, I
attempted to follow the same instructions. First, I executed the following
command:

dnf install binutils gcc make patch libgomp glibc-headers glibc-devel kernel-headers kernel-devel dkms

Although the command appeared to complete normally, it did show the following message:

Failed to synchronize cache for repo 'virtualbox', ignoring this repo.

I then executed:

dnf install VirtualBox-5.2

Results:

Fedora 29 - x86_64 - VirtualBox                                               

Failed to synchronize cache for repo 'virtualbox', ignoring this repo.

Last metadata expiration check: 0:05:45 ago on Sat 17 Nov 2018 03:40:42 PM PST.

No match for argument: VirtualBox-5.2

Error: Unable to find a match

I am not sure if this is relevant, but just out of curiosity, I executed

cd /

find -type f -iname "virtualbox.*"

find -type f -iname "virtualbox*" 

Results:

./var/cache/PackageKit/29/metadata/updates-29-x86_64/packages/virtualbox-guest-additions-5.2.20-1.fc29.x86_64.rpm

./var/cache/PackageKit/29/metadata/updates-29-x86_64/packages/virtualbox-guest-additions-5.2.22-1.fc29.x86_64.rpm

It seems as if Fedora 29 (complete install, not upgrade) is installing some
VirtualBox Guest-Addition rpm's. I will post a separate query re what I should do to install guest additions once I've got VirtualBox installed. I mention it in this posting only as it might relate to my specific problem.

Similarly, I'm unsure whether the following link is relevant:
VirtualBox failed to install in Fedora 26

In that link, I made a mistake and got UnixSE responses about backing out my
mistake before I did the install.

Questions:

1. Why am I getting the message "Failed to synchronize cache for repo virtualbox"?




2. Why am I getting the message "No match for argument: VirtualBox-5.2"?




3. Do I need to back anything out before I proceed with the install?




4. How do I install VirtualBox in Fedora 29.

Looking at the raw repo at http://download.virtualbox.org/virtualbox/rpm/fedora/ they don't seem to support 29 yet, only up to F28. You should be able to edit the repo file and change $releasever to 28 and then dnf install VirtualBox-5.2 .