apt update && apt -y full-upgrade && apt -y autoremove && apt autoclean

snap refresh && rm -rf /var/lib/snapd/cache/*

bleachbit

 Name                             Last modified      Size  Description
 Parent Directory                                      -   
 _config/                         2023-08-22 12:13    -   
 _etc_apt_sources.list.d_tmp.list 2017-03-03 13:35   99   
 _profile                         2017-02-06 10:02  371   
 _Xdefaults                       2023-08-29 12:29  2.1K  
 asennus.txt                      2025-08-06 12:57  4.5K  
 Asound.conf.txt                  2017-02-06 10:02  294   
 dotnet/                          2023-02-10 17:00    -   
 dropped-to-initramfs/            2022-11-27 16:29    -   
 microcloud/                      2023-11-16 23:44    -   
 mokutil/                         2024-04-13 15:04    -   
 poista                           2020-01-30 09:44  4.0K  
 real-time/                       2023-02-16 00:24    -   
 sources.list.JAMMY               2024-02-21 21:56  902   
 sources.list.MANTIC              2023-09-22 12:28  415   
 trusty_low_end_raudalla/         2020-01-13 23:00    -   
 wifi/                            2024-07-13 21:35    -   
 autoware/                        2024-05-20 13:14    -   autonomous driving 
 chiselled-containers/            2023-09-22 14:52    -   make them small again
 _jwmrc_and_icons.tar.xz          2025-07-15 07:35   31K  settings example
 jwm/                             2024-05-30 10:02    -   small but capable
 esm-apps/                        2023-09-24 10:45    -   ubuntu pro subscription

dpkg-query -W --showformat='${Installed-Size;6}\t${Package}\n' | sort -n

2504, on Xorg slow startup of GTK{3,4} apps?

apt install xwaylandvideobridge
apt autopurge xdg-desktop-portal
# ( if you can, stop and avoid everything Gnome related )

gsettings set org.gnome.desktop.interface monospace-font-name 'Ubuntu Mono 11'


journalctl --vacuum-time=1d   # if out of disk space

# remove snaps? e.g.
lsblk # note all 
umount /snap/core20/1169 
umount /snap/lxd/21624 
umount /snap/snapd/13170 
... ...
snap remove core20 
snap remove lxd
... ...
snap remove snapd 
systemctl stop snapd
systemctl stop snapd.socket 
apt -y purge snapd

snap-free firefox?

Ubuntu default for nVidia (if auto-uninstalled😆)

  $ sudo ubuntu-drivers autoinstall # if why?


beware legacy

Huge /var/log/journal ? once:

  # journalctl --vacuum-size=100M
  # journalctl --vacuum-time=3d

permanently:

# vi /etc/systemd/journald.conf
   .
   .
   SystemMaxUse=100M

# systemctl restart  systemd-journald

kvm/qemu on debian

reshape a data array? man rs
 ^
 ^ nice reading 


The Lovely Debian Wallpaper, 25 kB?
/usr/share/desktop-base/softwaves-theme/wallpaper/contents/images/2560x1440.svg