The nightly build is 6.99
There is a problem at Ubuntu which is not allowing updated nightly builds at the moment. It has been down for nearly 4 weeks now so the 6.99 version is now a month old, but you should get that month old version as a download.
Read the comment by @marekr in this thread.
Your 6.99 should look like this:
Application: KiCad
Version: 6.99.0-unknown-f8b157a1fb~149~ubuntu20.04.1, release build
Libraries:
wxWidgets 3.0.4
FreeType 2.10.1
HarfBuzz 2.6.4
FontConfig 2.13.1
libcurl/7.68.0 OpenSSL/1.1.1f zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh/0.9.3/openssl/zlib nghttp2/1.40.0 librtmp/2.3
Platform: Linux 5.4.0-124-generic x86_64, 64 bit, Little endian, wxGTK, cinnamon, x11
Build Info:
Date: Jul 21 2022 06:48:01
wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
Boost: 1.71.0
OCC: 7.5.2
Curl: 7.68.0
ngspice: 37
Compiler: GCC 9.4.0 with C++ ABI 1013
Build settings:
KICAD_USE_OCC=ON
KICAD_SPICE=ON