So, I keep getting the same error when upgrading from Ubuntu 18.04.2 LTS to Ubuntu 20.04.
I get upgrade suggestion from Software Update daily, and would really like to upgrade.
I have tried several times, using terminal as well, but I am new with Linux, so I couldn't figure out what went wrong there.
What should I do when this appears?
Hit:2 http://ppa.launchpad.net/somerville-dla-team/ppa/ubuntu bionic InRelease
Hit:4 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:5 http://archive.canonical.com/ubuntu bionic InRelease
Ign:7 http://dell.archive.canonical.com/updates bionic-dell-beaver-osp1-loras InRelease
Ign:8 http://oem.archive.canonical.com/updates bionic-oem InRelease
Hit:10 http://oem.archive.canonical.com/updates bionic-oem Release
Ign:11 http://dell.archive.canonical.com/updates bionic-dell-service InRelease
Hit:12 http://dell.archive.canonical.com/updates bionic-dell InRelease
Hit:14 http://dell.archive.canonical.com/updates bionic-dell-beaver-osp1-loras Release
Get:1 http://la-mirrors.evowise.com/ubuntu bionic InRelease [638 kB]
Get:3 http://la-mirrors.evowise.com/ubuntu bionic-updates InRelease [638 kB]
Get:6 http://la-mirrors.evowise.com/ubuntu bionic-backports InRelease [638 kB]
Get:9 http://la-mirrors.evowise.com/ubuntu bionic-security InRelease [638 kB]
Hit:16 http://dell.archive.canonical.com/updates bionic-dell-service Release
Err:1 http://la-mirrors.evowise.com/ubuntu bionic InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Err:3 http://la-mirrors.evowise.com/ubuntu bionic-updates InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Err:6 http://la-mirrors.evowise.com/ubuntu bionic-backports InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Err:9 http://la-mirrors.evowise.com/ubuntu bionic-security InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Reading package lists... Done
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
E: The repository 'http://la-mirrors.evowise.com/ubuntu bionic InRelease' is not signed.
E: Failed to fetch http://la-mirrors.evowise.com/ubuntu/dists/bionic/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
E: The repository 'http://la-mirrors.evowise.com/ubuntu bionic-updates InRelease' is not signed.
E: Failed to fetch http://la-mirrors.evowise.com/ubuntu/dists/bionic-updates/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: Failed to fetch http://la-mirrors.evowise.com/ubuntu/dists/bionic-backports/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: The repository 'http://la-mirrors.evowise.com/ubuntu bionic-backports InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://la-mirrors.evowise.com/ubuntu/dists/bionic-security/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: The repository 'http://la-mirrors.evowise.com/ubuntu bionic-security InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
apt-clone archdetect-deb btrfs-tools cryptsetup-bin dmraid
gir1.2-timezonemap-1.0 gir1.2-xkl-1.0 kpartx kpartx-boot
libdebian-installer4 libdmraid1.0.0.rc16 libido3-0.1-0 libtimezonemap-data
libtimezonemap1 python3-icu python3-pam rdate
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.