Stacer Error on Pop!OS 22.04: Updating from such a repository can't be done securely, and is therefore disabled by default.

But still installed, is it fine? $ sudo add-apt-repository ppa:oguzhaninan/stacer -y Repository: 'deb https://ppa.launchpadcontent.net/oguzhaninan/stacer/ubuntu/ jammy main' Description: Linux System Optimizer and Monitoring https://github.com/oguzhaninan/Stacer More info: https://launchpad.net/~oguzhaninan/+archive/ubuntu/stacer Adding repository. Found existing deb entry in /etc/apt/sources.list.d/oguzhaninan-ubuntu-stacer-jammy.list Adding deb entry to /etc/apt/sources.list.d/oguzhaninan-ubuntu-stacer-jammy.list Found existing deb-src entry in /etc/apt/sources.list.d/oguzhaninan-ubuntu-stacer-jammy.list Adding disabled deb-src entry to /etc/apt/sources.list.d/oguzhaninan-ubuntu-stacer-jammy.list Adding key to /etc/apt/trusted.gpg.d/oguzhaninan-ubuntu-stacer.gpg with fingerprint FE2D607711EDD0FF4D069EC70F6444BB6902FCAF Hit:1 http://apt.pop-os.org/proprietary jammy InRelease Hit:2 http://apt.pop-os.org/release jammy InRelease
Hit:3 http://apt.pop-os.org/ubuntu jammy InRelease
Hit:4 https://ppa.launchpadcontent.net/bamboo-engine/ibus-bamboo/ubuntu jammy InRelease Hit:5 http://apt.pop-os.org/ubuntu jammy-security InRelease
Hit:6 http://apt.pop-os.org/ubuntu jammy-updates InRelease
Hit:7 http://apt.pop-os.org/ubuntu jammy-backports InRelease
Ign:8 https://ppa.launchpadcontent.net/oguzhaninan/stacer/ubuntu jammy InRelease
Err:9 https://ppa.launchpadcontent.net/oguzhaninan/stacer/ubuntu jammy Release 404 Not Found [IP: 2620:2d:4000:1::3e 443] Reading package lists... Done E: The repository 'https://ppa.launchpadcontent.net/oguzhaninan/stacer/ubuntu jammy Release' does not have a Release file. 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. oldman@pop-os:~$ sudo apt install stacer Reading package lists... Done Building dependency tree... Done Reading state information... Done The following additional packages will be installed: fonts-league-spartan libqt5charts5 The following NEW packages will be installed: fonts-league-spartan libqt5charts5 stacer 0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded. Need to get 1,284 kB of archives. After this operation, 4,014 kB of additional disk space will be used. Do you want to continue? [Y/n] y Get:1 http://apt.pop-os.org/ubuntu jammy/universe amd64 fonts-league-spartan all 2.210-1 [173 kB] Get:2 http://apt.pop-os.org/ubuntu jammy/universe amd64 libqt5charts5 amd64 5.15.3-1 [493 kB] Get:3 http://apt.pop-os.org/ubuntu jammy/universe amd64 stacer amd64 1.1.0+ds-1 [618 kB] Fetched 1,284 kB in 1s (1,204 kB/s) Rsyncing /boot/efi into the filesystem before the call to timeshift. Using system disk as snapshot device for creating snapshots in BTRFS mode

/dev/sda4 is mounted at: /run/timeshift/backup, options: rw,relatime,compress=zstd:1,ssd,discard=async,space_cache=v2,subvolid=5,subvol=/

Creating new backup...(BTRFS) Saving to device: /dev/sda4, mounted at path: /run/timeshift/backup Created directory: /run/timeshift/backup/timeshift-btrfs/snapshots/2022-08-09_14-51-08 Created subvolume snapshot: /run/timeshift/backup/timeshift-btrfs/snapshots/2022-08-09_14-51-08/@ Created control file: /run/timeshift/backup/timeshift-btrfs/snapshots/2022-08-09_14-51-08/info.json BTRFS Snapshot saved successfully (0s) Tagged snapshot '2022-08-09_14-51-08': ondemand

/dev/sda4 is mounted at: /run/timeshift/backup, options: rw,relatime,compress=zstd:1,ssd,discard=async,space_cache=v2,subvolid=5,subvol=/

Removing snapshot: 2022-08-09_14-42-49 Deleting subvolume: @ (Id:260) Deleted subvolume: @ (Id:260)

Destroying qgroup: 0/260 Destroyed qgroup: 0/260

Deleted directory: /run/timeshift/backup/timeshift-btrfs/snapshots/2022-08-09_14-42-49 Removed snapshot: 2022-08-09_14-42-49

Selecting previously unselected package fonts-league-spartan. (Reading database ... 235701 files and directories currently installed.) Preparing to unpack .../fonts-league-spartan_2.210-1_all.deb ... Unpacking fonts-league-spartan (2.210-1) ... Selecting previously unselected package libqt5charts5:amd64. Preparing to unpack .../libqt5charts5_5.15.3-1_amd64.deb ... Unpacking libqt5charts5:amd64 (5.15.3-1) ... Selecting previously unselected package stacer. Preparing to unpack .../stacer_1.1.0+ds-1_amd64.deb ... Unpacking stacer (1.1.0+ds-1) ... Setting up libqt5charts5:amd64 (5.15.3-1) ... Setting up fonts-league-spartan (2.210-1) ... Setting up stacer (1.1.0+ds-1) ... Processing triggers for hicolor-icon-theme (0.17-2) ... Processing triggers for gnome-menus (3.36.0-1ubuntu3) ... Processing triggers for libc-bin (2.35-0ubuntu3.1) ... Processing triggers for fontconfig (2.13.1-4.2ubuntu5) ... Processing triggers for desktop-file-utils (0.26-1ubuntu3) ...