diff --git a/DESCRIPTION b/DESCRIPTION
index 1d8e94d..c438f49 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Type: Package
 Package: audit.base
 Title: Base package for Posit Checks
-Version: 0.7.5
+Version: 0.7.6
 Authors@R:
     person("Jumping", "Rivers", , "info@jumpingrivers.com", role = c("aut", "cre"))
 Description: Base package for sharing classes between posit audit
diff --git a/NEWS.md b/NEWS.md
index e288637..d341d67 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,7 @@
+# audit.base 0.7.6 _2026-10-16_
+  * fix: `check_sys_deps()` reads the distribution from os-release `ID` and `ID_LIKE`, and passes `VERSION_ID` to Posit Package Manager, so Ubuntu 26.04, RHEL 10, Debian, Rocky Linux and AlmaLinux work. If P3M or the package listing doesn't support a system, it warns with the reason and returns `NA` rather than stopping the audit (#58)
+  * fix: System requirements come from `packagemanager.posit.co`, Posit Package Manager's current address
+
 # audit.base 0.7.5 _2026-10-16_
   * fix: The Quarto version list comes from GitHub's releases, so a new minor release no longer marks the previous one as past EOL (#60)
 
diff --git a/R/check_sys_deps.R b/R/check_sys_deps.R
index 68dcfbf..174920f 100644
--- a/R/check_sys_deps.R
+++ b/R/check_sys_deps.R
@@ -14,6 +14,10 @@ check_sys_deps = function(os_release, installed_libs, debug_level = 0:2) {
   cli::cli_h2("Systems Libraries")
   # Clean up response
   pkg_look_up = get_os_sys_deps(os_release)
+  # get_os_sys_deps() and clean_libs() have warned why
+  if (!is.data.frame(pkg_look_up) || anyNA(installed_libs)) {
+    return(NA)
+  }
 
   # Determine which libs are missing
   missing_libs = pkg_look_up[!(pkg_look_up$sys_libs %in% installed_libs), ]
@@ -31,21 +35,18 @@ check_sys_deps = function(os_release, installed_libs, debug_level = 0:2) {
 # Contents of /etc/os-release
 get_os_sys_deps = function(os_release) {
   os_release_df = os_release_to_df(os_release)
-  version_id = os_release_df[os_release_df$name == "version_id", ]$value
-  if (is_ubuntu(os_release_df)) {
-    id = "ubuntu"
-  } else if (is_redhat(os_release_df)) {
-    id = "redhat"
-    version_id = stringr::str_remove(version_id, "\\..*")
-  } else if (is_centos(os_release_df)) {
-    id = "centos"
-    version_id = stringr::str_remove(version_id, "\\..*")
-  } else {
-    cli::cli_abort("This OS isn't supported")
+  system = get_p3m_system(os_release_df)
+  if (is.na(system$distribution)) {
+    os_name = os_release_value(os_release_df, "pretty_name") # nolint
+    cli::cli_warn("Can't check system libraries: Posit Package Manager doesn't support {os_name}")
+    return(NA)
+  }
+  reqs = get_pkg_requirements(distribution = system$distribution, release = system$release)
+  if (!is.data.frame(reqs)) {
+    return(NA)
   }
-  reqs = get_pkg_requirements(distribution = id, release = version_id)
   reqs = reqs[!is.na(reqs$sys_libs), ]
-  if (id == "ubuntu") {
+  if (system$distribution %in% c("ubuntu", "debian")) {
     reqs$sys_libs = switch_ubuntu_aliases(reqs$sys_libs)
   }
   reqs
@@ -59,14 +60,15 @@ get_os_sys_deps = function(os_release) {
 get_installed_libs = function() {
   os_release = get_os_release()
   os_release_df = os_release_to_df(os_release)
-  if (is_ubuntu(os_release_df)) {
+  tool = get_package_tool(os_release_df)
+  if (identical(tool, "apt")) {
     libs = processx::run("apt", args = c("list", "--installed"))
     libs = stringr::str_split(libs$stdout, "\n")[[1]][-1]
-  } else if (is_redhat(os_release_df) || is_centos(os_release_df)) {
+  } else if (identical(tool, "yum")) {
     libs = processx::run("yum", args = c("list", "installed"))$stdout
     libs = stringr::str_split(libs, "\n")[[1]][-(1:2)]
   } else {
-    cli::cli_abort("We don't support this OS yet")
+    libs = character(0)
   }
   clean_libs(os_release, libs)
 }
@@ -77,13 +79,16 @@ get_installed_libs = function() {
 #' @rdname get_installed_libs
 clean_libs = function(os_release, libs) {
   os_release_df = os_release_to_df(os_release)
-  if (is_ubuntu(os_release_df)) {
+  tool = get_package_tool(os_release_df)
+  if (identical(tool, "apt")) {
     libs = stringr::str_match(libs, "^[^/]*")[, 1]
     libs = switch_ubuntu_aliases(libs)
-  } else if (is_redhat(os_release_df) || is_centos(os_release_df)) {
+  } else if (identical(tool, "yum")) {
     libs = stringr::str_match(libs, "^[^\\.]*")[, 1]
   } else {
-    cli::cli_abort("We don't support this OS yet")
+    os_name = os_release_value(os_release_df, "pretty_name") # nolint
+    cli::cli_warn("Can't list the installed system libraries on {os_name}")
+    return(NA_character_)
   }
   sort(libs)
 }
diff --git a/R/get_pkg_requirements.R b/R/get_pkg_requirements.R
index 3e32745..5859b2d 100644
--- a/R/get_pkg_requirements.R
+++ b/R/get_pkg_requirements.R
@@ -1,12 +1,11 @@
-# https://packagemanager.rstudio.com/__api__/swagger/index.html#/default/get_repos
+# https://packagemanager.posit.co/__api__/swagger/index.html#/default/get_repos
+# NA, with P3M's reason as a warning, when P3M doesn't support the system
 get_pkg_requirements = function(
-  distribution = c("ubuntu", "redhat", "centos"),
-  release = c("18.04", "20.04", "22.04", "24.04", "7", "8", "9"),
-  base_url = "https://packagemanager.rstudio.com/__api__/repos/",
+  distribution,
+  release,
+  base_url = "https://packagemanager.posit.co/__api__/repos/",
   repo_id = 2
 ) {
-  distribution = match.arg(distribution)
-  release = match.arg(release)
   config_url = glue::glue(
     "{repo_id}/sysreqs?all=true&distribution={distribution}&release={release}"
   ) # nolint
@@ -15,8 +14,15 @@ get_pkg_requirements = function(
     "Connecting to {url} for system requirements"
   )
 
-  res = httr::GET(url)
+  res = httr::GET(url, httr::timeout(60))
   r = httr::content(res)
+  if (httr::http_error(res)) {
+    reason = if (is.list(r) && is.character(r$error)) r$error else httr::http_status(res)$message # nolint
+    cli::cli_warn(
+      "Posit Package Manager can't list system requirements for {distribution} {release}: {reason}"
+    )
+    return(NA)
+  }
 
   purrr::map_df(
     r$requirements,
diff --git a/R/os-helper-functions.R b/R/os-helper-functions.R
index 71ef569..6c65720 100644
--- a/R/os-helper-functions.R
+++ b/R/os-helper-functions.R
@@ -1,16 +1,42 @@
-is_ubuntu = function(os_release_df) {
-  os_name = os_release_df[os_release_df$name == "name", ]$value
-  stringr::str_detect(os_name, pattern = "ubuntu")
+# Posit Package Manager's distribution and release, from os-release ID, then ID_LIKE.
+# Rocky Linux and AlmaLinux list rhel in ID_LIKE, so they use the Red Hat requirements.
+get_p3m_system = function(os_release_df) {
+  p3m_names = c(
+    ubuntu = "ubuntu",
+    debian = "debian",
+    centos = "centos",
+    rhel = "redhat",
+    "opensuse-leap" = "opensuse",
+    sles = "sle"
+  )
+  ids = c(
+    os_release_value(os_release_df, "id"),
+    stringr::str_split(os_release_value(os_release_df, "id_like"), " ")[[1]]
+  )
+  distribution = unname(p3m_names[ids[ids %in% names(p3m_names)]])[1L]
+  release = os_release_value(os_release_df, "version_id")
+  # P3M uses the major version for these: 9, not 9.4
+  if (distribution %in% c("debian", "redhat", "centos")) {
+    release = stringr::str_remove(release, "\\..*")
+  }
+  list(distribution = distribution, release = release)
 }
 
-is_redhat = function(os_release_df) {
-  os_name = os_release_df[os_release_df$name == "name", ]$value
-  stringr::str_detect(os_name, pattern = "red hat")
+# apt or yum, which list installed packages in different formats; NA for any other OS
+get_package_tool = function(os_release_df) {
+  distribution = get_p3m_system(os_release_df)$distribution
+  if (distribution %in% c("ubuntu", "debian")) {
+    "apt"
+  } else if (distribution %in% c("redhat", "centos")) {
+    "yum"
+  } else {
+    NA_character_
+  }
 }
 
-is_centos = function(os_release_df) {
-  os_name = os_release_df[os_release_df$name == "name", ]$value
-  stringr::str_detect(os_name, pattern = "centos")
+os_release_value = function(os_release_df, name) {
+  value = os_release_df$value[os_release_df$name == name]
+  if (length(value) == 0L) "" else value[1L]
 }
 
 get_os_release = function() {
diff --git a/R/quarto-helpers.R b/R/quarto-helpers.R
index 2cdb625..b0ca65e 100644
--- a/R/quarto-helpers.R
+++ b/R/quarto-helpers.R
@@ -28,6 +28,10 @@ get_quarto_server_header = function(out) {
 #' @export
 get_quarto_sys_deps = function(out) {
   sys_deps = out$sys_deps
+  # NA when the system libraries couldn't be checked
+  if (!is.data.frame(sys_deps)) {
+    sys_deps = tibble::tibble(pkg = character(0), sys_libs = character(0))
+  }
   sys_deps %>%
     dplyr::group_by(.data$sys_libs) %>%
     dplyr::reframe(
diff --git a/tests/testthat/test-os-helper-functions.R b/tests/testthat/test-os-helper-functions.R
index 0bba955..7d6f47e 100644
--- a/tests/testthat/test-os-helper-functions.R
+++ b/tests/testthat/test-os-helper-functions.R
@@ -6,3 +6,47 @@ test_that("OS tests", {
   libs = get_installed_libs()
   expect_gt(length(libs), 1000)
 })
+
+test_that("get_p3m_system() maps os-release to P3M's distribution and release", {
+  os_releases = list(
+    ubuntu = c("ID=ubuntu", "ID_LIKE=debian", "VERSION_ID=\"26.04\""),
+    debian = c("ID=debian", "VERSION_ID=\"12\""),
+    rhel = c("ID=\"rhel\"", "ID_LIKE=\"fedora\"", "VERSION_ID=\"10.0\""),
+    centos = c("ID=\"centos\"", "ID_LIKE=\"rhel fedora\"", "VERSION_ID=\"7\""),
+    rocky = c("ID=\"rocky\"", "ID_LIKE=\"rhel centos fedora\"", "VERSION_ID=\"9.4\""),
+    alma = c("ID=\"almalinux\"", "ID_LIKE=\"rhel centos fedora\"", "VERSION_ID=\"8.10\""),
+    suse = c("ID=\"opensuse-leap\"", "ID_LIKE=\"suse opensuse\"", "VERSION_ID=\"15.6\""),
+    arch = c("ID=arch", "BUILD_ID=rolling")
+  )
+  expected = list(
+    ubuntu = c("ubuntu", "26.04"),
+    debian = c("debian", "12"),
+    rhel = c("redhat", "10"),
+    centos = c("centos", "7"),
+    rocky = c("redhat", "9"),
+    alma = c("redhat", "8"),
+    suse = c("opensuse", "15.6"),
+    arch = c(NA, "")
+  )
+  for (os in names(os_releases)) {
+    system = get_p3m_system(os_release_to_df(os_releases[[os]]))
+    expect_identical(c(system$distribution, system$release), expected[[os]], label = os)
+  }
+})
+
+test_that("Unsupported systems warn and give NA instead of stopping", {
+  arch = c("PRETTY_NAME=\"Arch Linux\"", "ID=arch")
+  expect_warning(check_sys_deps(arch, "zlib"), "arch linux")
+  expect_identical(suppressWarnings(check_sys_deps(arch, "zlib")), NA)
+  expect_warning(clean_libs(arch, "zlib"), "arch linux")
+  expect_identical(suppressWarnings(clean_libs(arch, "zlib")), NA_character_)
+
+  out = get_quarto_sys_deps(list(sys_deps = NA))
+  expect_equal(colnames(out), c("sys_libs", "pkg", "n"))
+})
+
+test_that("P3M's reason for rejecting a system reaches the user", {
+  skip_if_offline("packagemanager.posit.co")
+  expect_warning(get_pkg_requirements("rockylinux", "8"), "Unsupported system")
+  expect_identical(suppressWarnings(get_pkg_requirements("rockylinux", "8")), NA)
+})