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dnf update does nothing when there a no new packages.

What you need is a distro-upgrade :

1) use "screen" to have a terminal running in case something ( GDM restarts etc) wents wrong

CTRL+F4 will bring you in a text console where you can get back to your upgrade session with "screen -r" ofcourse you could start it there right away, but the resolution may not be the best. I prefer a big terminal, but thats just me. usually it will work without interruptions. You have been warned and instructed ;)

2) upgrade your installation manually :

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-26-$(uname -i) dnf clean all;dnf upgrade; ( you can skip this in your case ) dnf --allowerasing --releasever=26 --setopt=deltarpm=false distro-sync

Note: you can't upgrade to many revision ahead, because you lack the key for it. Solutions: you use 2 rev steps OR you get the keys for the newest fedora version from the webpage.

If you can't find it, run it step by step. This has the advantage of correcting mistakes and makes changes you otherwise would miss ( i.e. the /bin/ to /usr/bin/ fs corrections some fedora releases ago / just an example )

Have fun.

dnf update does nothing when there a no new packages.

What you need is a distro-upgrade :

1) use "screen" to have a terminal running in case something ( GDM restarts etc) wents wrong

CTRL+F4 will bring you in a text console where you can get back to your upgrade session with "screen -r" ofcourse you could start it there right away, but the resolution may not be the best. I prefer a big terminal, but thats just me. usually it will work without interruptions. You have been warned and instructed ;)

2) upgrade your installation manually :

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-26-$(uname -i) dnf clean all;dnf upgrade; ( you can skip this in your case ) dnf --allowerasing --releasever=26 --setopt=deltarpm=false distro-sync

-> use any higher rev as 26 if you already have ugraded to 26. <-

Note: you can't upgrade to many revision ahead, because you lack the key for it. Solutions: you use 2 rev steps OR you get the keys for the newest fedora version from the webpage.

If you can't find it, run it step by step. This has the advantage of correcting mistakes and makes changes you otherwise would miss ( i.e. the /bin/ to /usr/bin/ fs corrections some fedora releases ago / just an example )

Have fun.

dnf update does nothing when there a no new packages.

What you need is a distro-upgrade :

1) use "screen" to have a terminal running in case something ( GDM restarts etc) wents wrong

CTRL+F4 will bring you in a text console where you can get back to your upgrade session with "screen -r" ofcourse you could start it there right away, but the resolution may not be the best. I prefer a big terminal, but thats just me. usually it will work without interruptions. You have been warned and instructed ;)

2) upgrade your installation manually :

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-26-$(uname -i) -i)

dnf clean all;dnf upgrade; ( you can skip this in your case ) )

dnf --allowerasing --releasever=26 --setopt=deltarpm=false distro-sync

-> use any higher rev as 26 if you already have ugraded to 26. <-

Note: you can't upgrade to many revision ahead, because you lack the key for it. Solutions: you use 2 rev steps OR you get the keys for the newest fedora version from the webpage.

If you can't find it, run it step by step. This has the advantage of correcting mistakes and makes changes you otherwise would miss ( i.e. the /bin/ to /usr/bin/ fs corrections some fedora releases ago / just an example )

Have fun.