[PATCH] docs: ubuntu_essential.sh: explicitly add libcrypt-dev

[martin.jansa@gmail.com]

From: Martin Jansa <martin.jansa@gmail.com>

In latest ubuntu-26.04 build-essential no longer installs libcrypt-dev
But virtual/crypt-native is in ASSUME_PROVIDED and is expected to be
usable for development.

It used to be installed as build-essential -> libc6-dev -> libcrypt-dev,b
ut not anymore since 2.42-7:

25.10 questing with 2.42-0ubuntu3.1:
https://packages.ubuntu.com/questing/libc6-dev
26.04 resolute with 2.43-2ubuntu1:
https://packages.ubuntu.com/resolute/libc6-dev

https://changelogs.ubuntu.com/changelogs/pool/main/g/glibc/glibc_2.43-2ubuntu1/changelog:
...
glibc (2.42-7) unstable; urgency=medium

  [ Aurelien Jarno ]
  * debian/control.in/libc, debian/rules.d/debhelper.mk: drop libcrypt-dev
    dependency from libc6-dev. Thanks to Helmut Grohne for proposing that,
    doing an archive rebuild and filling the bug reports.
  * debian/control.in/main, debian/sysdeps/linux.mk: enable SystemTap static
    probes.
  * debian/debhelper.in/libc-dev.NEWS: add a NEWS entry about the removal of
    the obsolete termio interface.  Closes: #1124068.
  * debian/rules.d/debhelper.mk: ensure that linker scripts work even when
    /usr is unmerged.  Closes: #1120508
  * debian/debhelper.in/libc-dev{,-alt}.lintian-overrides,
    source/lintian-overrides, rules.d/debhelper.mk, salsa-ci.yml: drop
    unpack-message-for-{orig,source} overrides, fixed in lintian 2.128.0.
  * debian/control.in/main: drop Rules-Requires-Root: no, this is now the
    default.
  * debian/libc6.symbols.i386, debian/libc6-i386.symbols.{amd64,x32}: remove
    the workaround for GLIBC_ABI_GNU_TLS.  Closes: #1122038.
  * debian/control.in/{libc,i386}: ensure that libdpkg-perl is fixed wrt
    GLIBC_ABI_GNU_TLS.

 -- Aurelien Jarno <aurel32@debian.org>  Sun, 04 Jan 2026 10:07:24 +0100
...

Without libcrypt-dev installed on host building shadow-native will
fail with:
  checking for crypt in -lcrypt... no
  configure: error: crypt() not found
and python3-native with:
  The necessary bits to build these optional modules were not found:
  _crypt
  To find the necessary bits, look in configure.ac and config.log.

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
---
 documentation/tools/host_packages_scripts/ubuntu_essential.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/documentation/tools/host_packages_scripts/ubuntu_essential.sh b/documentation/tools/host_packages_scripts/ubuntu_essential.sh
index 6584a0403..6234f885e 100644
--- a/documentation/tools/host_packages_scripts/ubuntu_essential.sh
+++ b/documentation/tools/host_packages_scripts/ubuntu_essential.sh
@@ -1 +1 @@
-sudo apt-get install build-essential chrpath cpio debianutils diffstat file gawk gcc git iputils-ping libacl1 locales python3 python3-git python3-jinja2 python3-pexpect python3-pip python3-subunit socat texinfo unzip wget xz-utils zstd
+sudo apt-get install build-essential libcrypt-dev chrpath cpio debianutils diffstat file gawk gcc git iputils-ping libacl1 locales python3 python3-git python3-jinja2 python3-pexpect python3-pip python3-subunit socat texinfo unzip wget xz-utils zstd