Step 3: *$ sudo add-apt-repository ppa:elementary-os/stable * > *$ sudo apt update* > *Err: 24 http://ppa.launchpad.net/elementary-os/stable/ubuntu > artful Release* > * 404 Not Found* > *Reading Package Lists ... Done* > *E: The "http://ppa.launchpad.net/elementary-os/stable/ubuntu > artful Release" > repository does not contain a Release file.* > *N: Updating from this repository can not be performed in a secure way, > and therefore by default it is disabled.* > *N: See the apt-secure (8) man page for creating a repository and > configuring the user.* > *$ sudo apt install com.github.babluboy.bookworm* > *Reading Package Lists ... Done* > *Building a Dependency Tree* > *Reading status information ... Done* > *Some packages can not be installed. Perhaps you are asking for the > impossible,* > *or use an unstable version of the distribution, where you requested* > *packages are not yet created or have been removed from Incoming.* > *The following information may help you:* > > *Packages with unsatisfied dependencies:* > * com.github.babluboy.bookworm: Depends: libgranite4 (> = 0.4.1) but it > can not be installed* > *E: It is impossible to fix errors, you have held broken packages.* 2018-02-18 15:15 GMT+03:00 Oleg Vladimirov