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I'm having trouble getting PHP 7.4 to install on 18.04 now, as it seems to depend on a version of libc6 that is not available on 18.04.

I have no tried building from source as I would like to avoid that if possible.

sudo add-apt-repository ppa:ondrej/php sudo apt update sudo apt install php7.4-fpm

results in

The following packages have unmet dependencies: php7.4-fpm : Depends: php7.4-cli but it is not going to be installed Depends: php7.4-common (= 7.4.22-1+ubuntu20.04.1+deb.sury.org+1) but it is not going to be installed Depends: php7.4-json but it is not going to be installed Depends: php7.4-opcache but it is not going to be installed Depends: libc6 (>= 2.29) but 2.27-3ubuntu1.4 is to be installed E: Unable to correct problems, you have held broken packages.

If I look specifically at lib6c we can see there is nothing available to satisfy the version requirement:

$ sudo apt-cache policy libc6 libc6: Installed: 2.27-3ubuntu1.4 Candidate: 2.27-3ubuntu1.4 Version table: *** 2.27-3ubuntu1.4 500 500 http://us-east1.gce.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 100 /var/lib/dpkg/status 2.27-3ubuntu1.2 500 500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages 2.27-3ubuntu1 500 500 http://us-east1.gce.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
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  • 1
    This requires 20.04 LTS. Commented Aug 18, 2021 at 20:03

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This may not be very helpful, but I was able to install php7.4-fpm on Ubuntu 18.04LTS with no errors. I originally needed php7.4 for use with Matomo. I used this writeup Update to PHP 7.4 on Ubuntu 18.04 on Digital Ocean for WordPress as applicable to my setup.

I didn't technically need the php7.4-fpm, but decided to test it after seeing this post. Installed with no issues reported. Here's what I have:

Ubuntu

Linux 4.15.0-154-generic #161-Ubuntu SMP Fri Jul 30 13:04:17 UTC 2021 Distributor ID: Ubuntu Description: Ubuntu 18.04.5 LTS Release: 18.04 Codename: bionic

libc6

$ sudo apt-cache policy libc6 libc6: Installed: 2.27-3ubuntu1.4 Candidate: 2.27-3ubuntu1.4 Version table: *** 2.27-3ubuntu1.4 500 500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 100 /var/lib/dpkg/status 2.27-3ubuntu1.2 500 500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages 2.27-3ubuntu1 500 500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

php7.4-fpm

$ sudo apt-cache policy php7.4-fpm php7.4-fpm: Installed: 7.4.23-1+ubuntu18.04.1+deb.sury.org+1 Candidate: 7.4.23-1+ubuntu18.04.1+deb.sury.org+1 Version table: *** 7.4.23-1+ubuntu18.04.1+deb.sury.org+1 500 500 http://ppa.launchpad.net/ondrej/php/ubuntu bionic/main amd64 Packages 100 /var/lib/dpkg/status

And the full report from php7.4-fpm install:

$ sudo apt install php7.4-fpm Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: php7.4-fpm 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 1,410 kB of archives. After this operation, 4,750 kB of additional disk space will be used. Get:1 http://ppa.launchpad.net/ondrej/php/ubuntu bionic/main amd64 php7.4-fpm amd64 7.4.23-1+ubuntu18.04.1+deb.sury.org+1 [1,410 kB] Fetched 1,410 kB in 1s (1,514 kB/s) Selecting previously unselected package php7.4-fpm. (Reading database ... 27179 files and directories currently installed.) Preparing to unpack .../php7.4-fpm_7.4.23-1+ubuntu18.04.1+deb.sury.org+1_amd64.deb ... Unpacking php7.4-fpm (7.4.23-1+ubuntu18.04.1+deb.sury.org+1) ... Setting up php7.4-fpm (7.4.23-1+ubuntu18.04.1+deb.sury.org+1) ... Creating config file /etc/php/7.4/fpm/php.ini with new version NOTICE: Not enabling PHP 7.4 FPM by default. NOTICE: To enable PHP 7.4 FPM in Apache2 do: NOTICE: a2enmod proxy_fcgi setenvif NOTICE: a2enconf php7.4-fpm NOTICE: You are seeing this message because you have apache2 package installed. Created symlink /etc/systemd/system/multi-user.target.wants/php7.4-fpm.service → /lib/systemd/system/php7.4-fpm.service. Processing triggers for man-db (2.8.3-2ubuntu0.1) ... Processing triggers for ureadahead (0.100.0-21) ... Processing triggers for systemd (237-3ubuntu10.51) ... Processing triggers for php7.4-fpm (7.4.23-1+ubuntu18.04.1+deb.sury.org+1) ... NOTICE: Not enabling PHP 7.4 FPM by default. NOTICE: To enable PHP 7.4 FPM in Apache2 do: NOTICE: a2enmod proxy_fcgi setenvif NOTICE: a2enconf php7.4-fpm NOTICE: You are seeing this message because you have apache2 package installed.
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  • the instructions are about the same as what i did, so maybe this bug has just been fixed since i posted? Commented Aug 30, 2021 at 18:30
  • Hard to tell what the issue was without being able to replicate, but yeah, must be fixed. Commented Aug 30, 2021 at 23:02
  • ondrej server does not contain the packages anymore?! I get ` Unable to locate package php7.4-fpm. Also when I browse to ppa.launchpad.net/ondrej/php/ubuntu/dists/bionic/main/…` the Packages.gz file is only 20 bytes. Commented Jun 18, 2023 at 8:07
  • Considering the timing, I'm guessing it was a permanent change to the ondrej repo, because support for Ubuntu 18.04 LTS seized following 5 years after its release. When security fixes stop flowing, ideally there's no reason to continue using the operating system or its components in any production environment. Commented Jun 16, 2024 at 4:40

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