Schedule
https://wiki.ubuntu.com/PluckyPuffin/ReleaseSchedule

ReleaseNotes
https://wiki.ubuntu.com/PluckyPuffin/ReleaseNotes

Known issues
https://wiki.ubuntu.com/FocalFossa/ReleaseNotes#Known_issues

Download
Releases: https://releases.ubuntu.com/releases/25.04
Cloud image (minimal): https://cloud-images.ubuntu.com/minimal/daily/focal/current/focal-minimal-cloudimg-amd64.img
Netboot: http://archive.ubuntu.com/ubuntu/dists/focal/main/installer-amd64/current/images/netboot/mini.iso
Torrent: http://releases.ubuntu.com/20.04/ubuntu-20.04-desktop-amd64.iso.torrent

Repository

echo "deb http://de.archive.ubuntu.com/ubuntu focal main restricted universe multiverse" \
    sudo tee /etc/apt/sources.list.d/ubuntu-focal.list
echo "deb http://de.archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse" \
    sudo tee /etc/apt/sources.list.d/ubuntu-focal-updates.list

# v2
deb [arch=amd64] http://de.archive.ubuntu.com/ubuntu focal main restricted universe multiverse
deb [arch=amd64] http://de.archive.ubuntu.com/ubuntu focal-updates main restricted universe multiverse
deb [arch=amd64] http://de.archive.ubuntu.com/ubuntu focal-security main restricted universe multiverse
deb [arch=amd64] http://de.archive.ubuntu.com/ubuntu focal-backports main restricted universe multiverse

sudo apt update

DEP

Workarounds

# skip disk check
fsck.mode=skip

# Install and configure python2 as default
sudo apt install -y python-is-python2

# set python3 as default
apt install -y python-is-python3

# Install PIP 2 under Ubuntu 20.04
wget https://bootstrap.pypa.io/2.7/get-pip.py -qO- | python2

Reenable hle and rtm CPU flags
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1853200
https://unix.stackexchange.com/questions/43539/what-do-the-flags-in-proc-cpuinfo-mean
https://access.redhat.com/articles/tsx-asynchronousabort

# /etc/default/grub
...
GRUB_CMDLINE_LINUX_DEFAULT="... tsx=on"
...

update-grub

# fix ImageMagick (convert-im6.q16: attempt to perform an operation not allowed by the security policy `PDF' @ error/constitute.c/IsCoderAuthorized/408.)
sudo sed -i '/disable ghostscript format types/,+6d' /etc/ImageMagick-6/policy.xml

ZFS
https://linsomniac.gitlab.io/post/2020-04-09-ubuntu-2004-encrypted-zfs/